Posted by **Jimmy** on Tuesday, June 26, 2012 at 4:30pm.

There is a water tank with a drain of an unknown size that is always open. There is a series of input pipes above it which are all the same size. When 4 pipes are on, it takes 6 hours to fill. When 3 pipes are on, it takes 10 hours to fill. How many pipes would it take to fill the tank in 3 hours?

- Algebra -
**Steve**, Tuesday, June 26, 2012 at 10:46pm
if an input pipe could fill the tank in x hours, and the drain could empty it in y hours with no input,

4/x - 1/y = 1/6

3/x - 1/y = 1/10

x=15,y=10

so, if n pipes fill the tank in 3 hours,

n/15 - 1/10 = 1/3

n = 13/2

Hmmm. I was expecting an integer.

- Algebra -
**Jimmy**, Wednesday, June 27, 2012 at 12:58am
Could you help explain how T can put the number of pipes over the time to solve this?? I'm afraid I don't understand.

## Answer This Question

## Related Questions

- college algebra - water from a tank is being used for irrigation while the tank ...
- Maths - 3 inlet pipes A,B and C can be used to fill 1000m^3 water storage tank...
- Algebra 1 - The first of three pipes fills a tank in 12 minutes and a second ...
- physics - Find the static pressure that exists in your house water pipes if the ...
- Algebra - Two pipes can fill a tank in 9 hours. If the bigger of the pipes has a...
- Physics - The 3.0 cm-diameter water line splits into two 1.0cm-diameter pipes. ...
- Algebra 1 - The first of three pipes fills a tank in 12 minutes and a second ...
- math - the fill pipe for a tank can fill the tank in 4 hours and the drain pipe ...
- maths - Two pipes A and B can fill in 40 minutes and 30 minutes respectively....
- math - Two pipes A and B can fill a tank in 3 and 6 min respectively.Starting ...

More Related Questions