Posted by **patel** on Friday, October 21, 2011 at 9:09am.

a tank can be filled by one pipe in 3.5 hours and emptied by another in 4.2 hours. if both pipes are running, how long will take to fill an empty tank ?

- maths -
**bobpursley**, Friday, October 21, 2011 at 9:26am
rate=amount/time

rate combined=sum of rates=1tank/3.5hr+1tank/4.2hrs

rate combined=(4.2+3.5)/(3.5*4.2) tanks/hr work this out.

time= 1tank/(above rate)

- maths -
**Steve**, Friday, October 21, 2011 at 12:54pm
I also misread the problem. It is being emptied at 4.2 hrs.

## Answer this Question

## Related Questions

- maths - a tank can be filled by one pipe in 3.5 hours and emptied by another in ...
- math - a tank can be filled by one pipe in 3.5 hours and emptied by another in 4...
- math - a tank can be filled by one pipe in 3 .5 hours and emptied by another in ...
- Math - A tank is filled with an intake pipe that will fill it in 5 hours and an ...
- math - the fill pipe for a tank can fill the tank in 4 hours and the drain pipe ...
- college algebra - an inlet pipe can fill a large water tank in 3 hours. an ...
- math - A tank fitted with two pipes is to filled with water. One pipe can fill ...
- Math - One pipe fills a tank in 1 hour while another pipe can fill the same tank...
- college algebra - water from a tank is being used for irrigation while the tank ...
- Algebra - Two pipes fill a storage tank in 9 hours. If the larger pipe fills the...

More Related Questions