Thursday

August 21, 2014

August 21, 2014

Posted by **Sean** on Tuesday, October 17, 2006 at 10:17pm.

The answer is 15 minutes. But how?

Figure the rate each can fill the pool

jim rate= 1/30 (1pool/30 min)

same relation for others.

The total rate then is the sum...

ratetotal=1/30 + 1/45 + 1/90

so we have one pool to do in this rate in some time T.

1= ratetotal*time

solve for time.

BobP answered this correctly, I thought I'd just answer it for the practice.

This kind of problem requires you to determine the individual rates, then add them to get a total answer. It looks like

1pool(1/30min + 1/45min + 1/90min) = 1pool (6/90min) = 1pool/15min

These kinds of problems are very common on tests for some reason. Change the numbers and try working another problem similar to this just for practice.

**Related Questions**

Math - Jim can fill a pool carrying bucks of water in 30 minutes. Sue can do the...

math - Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do ...

math - Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do ...

Math - Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do ...

math - Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do ...

Algebra - Sue can shovel snow from her driveway in 45 minutes. Jim can do the ...

math - One pipe can fill a pool in 20 minutes, a second can fill the pool in 30 ...

math - Jane needs to fill her pool with water. Ace said it will take them 40 ...

Math - Jim can fill a pool in 30 min, sue can do it in 45 min, Tony can do it in...

algebra - Pump A can fill a swimming pool in 6 hours and pump B can fill the ...