Hey /b/ I have a test for you. Prove you are smart.
The stories and information posted here are artistic works of fiction and falsehood.
Only a fool would take anything posted here as fact.
Only a fool would take anything posted here as fact.
Hey /b/ I have a test for you. Prove you are smart.
>>685763070
-2 h
69. Lol meme dank joke
>>685763267
>>685763283
wrong!
It takes 8h to fill the tub (shit at math btw)
Can't be solved. Too many variables
it would never fill since B is draining the water
>>685763070
every 8 hours it will fill 2 hours worth of 1.
24 hours
>>685763070
about 14 gallons
>>685763070
it's already full...
18hrs
Why does the bathtub take so fucking long to fill? That is the real question.
>>685763070
48 hours. Simple.
>>685763527
What's the logic/math behind that? I found another answer.
>>685763808
how's that? explain.
Lets say the bathtub can hold 1L of water.
1000/6=166.67
1000/8=125
166.67-125=41.67
1000/41.67=21.4 hours
>>685763070
Hold the door
>>685763527
This looks correct. as long as we aren't including fluid dynamics and pressure into the mix
>>685763572
correct anon
>>685763878
wrong, I did the same first time I tried to solve it.
24 hours.
>>685763894
We are not including fluid dynamics and pressure. Explain please. I got another answer.
Lowest common denominator of 8 and 6 is 24 so let's arbitrarily make that the volume of the tub. If the the tub is filled in 6 hours that means it is filling at a rate of 4 per hour. If it empties in 8 hours that means it is emptying at 3 per hour. That's a net of 1 filled per hour. So it would take 24 hours to fill the tub.
>>685763828
After 8 hrs it would've drained once while filling 6 + a third again. So 3 times over 8hrs, 24
>>685763948
Is it 24 hours?>>685763527
If we are talking real world it would never fill as the pressure would increase as the tub fills meaning it would drain faster.
24 hours?
>>685763070
18 h
Since B is a drain and not a tap, Id say it'll take about 6 hours.
>>685763070
Volume = V
Filling rate = 1/6Vhr^-1
Emptying rate = 1/8Vhr^-1
When both are open:
1/6V*h- 1/8V*h = V where V = volume filled and h = time elapsed in hours
h(1/6-1/8) = 1
h=1/(8/48-6/48)
H=48/2 = 24hrs
>>685764033
Every 6 hours tap 1 fills the tub. But in 8 hours the tub is drained by tap 2. Then the extra 2 hours worth of flow that tap 1 puts out beyond 6 hours (8 hours) is extra water. If the tub fills normally in 6 hours without tap 2 open then it would take 3 times 8 hour intervals to completely fill the tub.
x is the amount of time it would take to fill this shit up.
1/6*x-1/8*x=1
1/24*x=1
x=24 hours
>>685764059
I got 32 hours. I divided 6/8 and got 0.75 or 75%. And then I thought the bathtub filled 100% but emptied 75% so it remained only 25% full. And then I did something like this. 8h . . . 25% ; xh . . . 100% . And then I did that rule with numbers (8*100)/25, and got 32h.
>>685764493
>>685764543
>>685764567
You are all making the task more complex than it needs to be.
24 hours >>685764509
>>685764509
Thanks!
9 + 1 + 1 = 24 hours
>>685763070
(1/6)-(1/8) is how fast water gets in when both valves are open. Equals 0.041(6). Equals 1/24.
So the answer is 24 hours.
Is anyone taking into account the siphoning effect on the rate of drainage?
>>685764614
>>685764543 is the simplest solution ITT
>>685764614
You are making it too complex too.
check >>685764918
A=1/6h B=1/8h
1/6h - 1/8h = 4/24h - 3/24h
4/24h - 3/24h = 1/24h
24h without engagement
>>685764614
Can't help but make it an algebra problem. It's just how my brain processes problems like this.
>>685763070
assuming we are taking the pressure into account it would take more than 24 hours since the tub would be filling faster than it would normally drain causing more time where the box is more than averagely full. so yeah op is a faggot
>>685764953
>>685765008
Didn't properly read your math anons. I don't think in equations, so it seems simpler to me to write the problem out. I can do maths but I don't read numbers as well as I do ideas. You are right. The solution is probably simpler the way you put it
> X IS THE VOLUME
>A IS 6
>B IS 8
>B IS 1/3 SMALLER THAN A
>SO 1/3 OF WATER WILL REMAIN EVERYTIME
>IT WILL TAKE 3 TIMES MORE HOURS TO COMPLETE THE TASK
3*6=18
>>685765333
Retard alert!
>>685765333
6/8=1/3
Is it bait?
>>685765333
wrong. We have already established that it would take 3 times 8 hours anon. read the thread
Ok, thanks all for your answers! Anyone has more problems like this?
>>685763527
This
>>685765460
He is saying that 2/3 drains out while 1/3 remains in the tub.
>>685765401
dont think so, as far as i see you guys are only saying stupid things, 8h to empty and 6h to fill means you have a bigger pipe pouring than emptying, then u get how smaller the pipe is, and then its done.
8/6= 1,3
6/3=2
8/4=2
>>685763070
Every 8 hrs it's empty but it only takes 6 hrs to fill it so +2hrs of water for every 8 so 24 I believe if I'm correct that means the b drain is 1/4 smaller of a tube
>>685765725
Gay and wrong. Nothing wrong with being gay though
>>685765478
no bro, if you put 6 litres of water you have 1 litre each hour, then u empty the tub and you empty at a speed of 0,66 litres an hour.
Meaning that every hour you got 0,33 litres, then you have 1 litre after 3 hours, up to 6 litres of water it takes 3*6=18
>>685765668
He is wrong by not converting time(6h) into volume/hour (1/6 per hour).
Then it is clear that 1/6 fills in while 1/8 leaks out, that leaves 1/24 of volume per hour.
>>685763070
If you pump /a/ into /b/ and let the original /b/ flow out at a slightly slower rate you get fine /h/ material.
>>685765333
It's 3/4's not 1/3
6 and 8 can only be reduced by 2
So 6/8 =3/4
>>685765333
It's trips, so he can't be wrong, even if it is mathematical nonsense.
>>685764048
We got a wiener here!
>>685765927
>>685766024
Only Asians could over complicate a problem using maths. Being good at maths doesn't help you see what the problem is. 24 hours master race here!
>>685763527
This guy is bang on
After 8 hours 1 whole tub has drained. However it takes 6 hours to fill it, so in that time it has filled that much plus an extra 2 hours worth of filling time. If it takes 6 hours to fill then in the 2 extra hours it fills one third. Times these 8 hours by 3 to get 24 hours.
>>685765930
no, it takes less to fill than it takes to empty, and B is smaller than A
also explain, i think you are wrong but maybe is just me
Fills 1/6 bathtubs per hour (b/h)
Loses 1/8 b/h
1/6-1/8
Resultant fill rate is 1/24 b/h
Therefore: 24 hours per 1 bathtub
>>685763070
6 hours to fill 1 bathtub.
8 hours to drain 1 bathtub.
48 hours to fill 8 bathtubs.
48 hours to drain 6 bathtubs.
48 hours to fill 2 bathtubs with both valves open.
24 hours to fill 1 bathtub with both valves open.
mfw reading all this nonsense.
How the fuck will it take 24h to fill for god sake you guys should go back to high school
>>685766618
What is your answer?
outlet flow is not linear and is proportional to the square root of the height in the tank. if i still had a cracked copy of mathcad i'd make a pretty graph
>>685766618
take the plug out of your bath and see how long it takes to fill.
>>685763070
12h you dumb fuck
>>685766207
It's not as much gibberish in my head.
I once had a teacher who always wanted me to show my work or she'd fail me and claim I was cheating. I explained it to her one time , she couldn't grasp that I could find quicker methods and obtain the correct answer so she stopped trying to make me show my work....
>I do math while I drive for fun
>my job requires me to be able to give etas within 30 minutes up to a week away
>>685766614
This is the simplest solution imo.
New problem!
The distance between cities A and B is 720 km. There is a train going from A to B at the speed of 80 km/h. 2 hours after its departure from B to A departs another train that goes 60 km/h. How many hours after the first train's departure would the two trains meet?
>>685763070
I think it takes 9 hours but I flunked 9th grade. so that's makes sense to me
>>685766935
Does this mean you are Asian? In that case I wish you the best of luck in the maths field. Just leave the driving to someone else ok buddy.
>>685763070
Its 8/6 = 1.33 hours approximately
>>685767045
After 2 hours the distance between trains is 560.
560km/(80+60)km/h=4h
The answer is 6 hours.
>>685763070
24 hours
>>685767045
I have a better problem. THE JEWISH QUESTION
If it can be solved with maths I would like to see it
>>685766747
18 since every hour you have:
Lets say you have 18L of water
it takes 6 hours to fill it
so it takes 3L each hour
then you have to empty 18L in 8 hours so it empties 0,6L each hour, it means that pipe B is 2/3 of pipe A size meaning it takes 4/3 the time to empty it than to fill it
if every hour you have 0,3L you have 1/3 of whatever A fills, meaning it takes 3 hours to fill 1 hour of A
So 3 hours to do the job of 1 means every hour you have 3 hours, 6x3=18
>>685767268
1 full bath tub = 4full bath tubs(4*6) - 3 empty bathtubs(3*8)
4-3 = 1
>>685767227
Well done anon
>>685767288
x jews + 1 hitler = (x - 6000000)jews
>>685763070
The tub is filled by 25% every 6 hours, so the answer is 24 hours assuming we are ignoring pressure.
>>685767424
nope.
>>685767470
Good answer anon.
>>685767138
Kek no I'm not a Asian no worries there I have a soul
>>685767464
Yay. Those were calculus problems in my 5th class.
When do americans solve those in school?
>>685767515
80x2=160
720-160=560 remaining
4×80=320 + 4x60=240 =560
So 4 unless I misread it I am tired
>>685767227
>560
Did someone take a bath in the tub while it was filling/draining? Did they splash? Piss in the water?
>>685767821
you forgot the two hours.
>>685767536
>>685763439
>shit at math btw
Yeah, we can see that.
you can't fill it up. It will always drain.
>>685769445
It is filling up faster than it is draining, so at some point it will fill up the bath then overflow.
>>685763070
if you drain it for 6 hours, 20% remain. so every hour, 1/5th of the bathtub gets filled.
answer is 30 hours.
just have a shower
