SOLUTION: You are the head of the general services division of a famous resort in your locality with the widest swimming pool. Five pipes we're installed in the pool. Three of which one used

Question 1041361: You are the head of the general services division of a famous resort in your locality with the widest swimming pool. Five pipes we're installed in the pool. Three of which one used for filling and the other two for draining. The filling pipes A,B, and C can fill the pool in 9 hours, 7 hours and 10 hours respectively. The pool can be drained in 12 hours using pipe D and 15 hours using pipe E.
The owner want you to change the water of the pool immediately because of some impurities. But it takes a longer time for you to make it filled up than the normal time needed. Then you found out the pipes D and E were open while pipes A, B, and C were filling the pool. Your report should contain the computation for the total number of hours it took to fill the swimming pool and it's difference from the normal of hours required to fill the pool.
Answer by ikleyn(52818) (Show Source): You can put this solution on YOUR website!
.
Too tricky formulation.

It must be more straightforward.

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