SOLUTION: A pump can fill a swimming pool in 6 hours. Another pump can fill it in 9 hours. The first pump breaks down after working for 4.5 hours. How many hours it will take does the seco

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Question 1057004: A pump can fill a swimming pool in 6 hours. Another pump can fill it in 9 hours. The first pump breaks down after working for 4.5 hours.
How many hours it will take does the second pump to finish the job?
Answer by ikleyn(52800)   (Show Source): You can put this solution on YOUR website!
.
A pump can fill a swimming pool in 6 hours. Another pump can fill it in 9 hours. The first pump breaks down
after working for 4.5 hours. How many hours it will take does the second pump to finish the job?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

In 4.5 hours the first pump filled  =  of the pool volume.

Hence,  of the volume remained unfilled.

If the second pump can fill the entire pool in 9 hours,
it will fill the remaining  of the volume in 4 times faster.

So, it will take  hours =   hours = 2 hours and 15 minutes for the second pump to finish the job.


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