SOLUTION: sally takes 30 minutes to fill the pool with water. sam takes 45 minutes. tim takes 1.5 hours. How long will it take all 3 to fill the pool? how to solve word problems

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Question 733186: sally takes 30 minutes to fill the pool with water. sam takes 45 minutes. tim takes 1.5 hours. How long will it take all 3 to fill the pool? how to solve word problems
Answer by mbmodak(32) (Show Source):
You can put this solution on YOUR website!
In one minute
sally will fill 1/30 th tank
sam will fill 1/45 th tank
tim will fill 1/(1.5 hrs)or90
So together all three shall fill the portion of tank in one minute=
1/3+1/45+1/90= 0.066666667
I.E For 0.066667th portion of tank to be filled by all three it takes one minute
Therefor for 1(full) tank to be filled by all three time taken in mins=
1/0.06667= 15

You can varify your answer
In 15 mins Sally's addition is 15/30,sam's 15/45 & tims' 15/90
15/30+15/45+15/90=
1