Jim can fill pool carrying water in 30 mins,Sue in 45 min &Lee -1& a half hr.Time it takes for the 3 together?

Question

Need Help...

Answer 1

You can think of the question this way...

In 30 minutes,

  Jim can fill the pool fully

  Sue can fill 2/3 of a pool (I got 2/3 from 30/45 which is 30 minutes divide by 45 minutes)

  Lee can fill 1/3 of a pool (1 got 1/3 from 30/90 which is 30 minutes divide by 90 minutes)

So this means that in 30 minutes, Jim can fill 1 pool and Sue & Lee together can fill another pool (2/3 + 1/3 = 1).  Total is 2 pools of water.

So if you need to fill just 1 pool of water, you take half of the time then... which is 30/2 = 15 minutes.

Answer 2

30 min +45min +90 min = 165 min

165 min/3=55 minutes

Answer 3

it would be less than 30 min

Answer 4

30+45+1.30=76.3 divide by 3 =25.4333333..........

if you do it by averaging, you don't tell us how we're supposed to solve the problem (what formula?)

Answer 5

1/4hour or 15 min.

Add the reciprocals of each.

1/.5 +1/.75 +1/1.5=4

the reciprocal of 4 is 1/4