SOLUTION: A swimming pool is filled by 2 taps and emptied by a drain pipe. Tap No 1 is able to fill the pool in 4 hours. Tap No 2 is able to fill the pool in 3 hours. The drain pipe empties

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Question 1038214: A swimming pool is filled by 2 taps and emptied by a drain pipe. Tap No 1 is able to fill the pool in 4 hours. Tap No 2 is able to fill the pool in 3 hours. The drain pipe empties the pool in 90 minutes. At 8.P.M. some vandals turned both taps on and also opened the drain outlet. At what time will the pool be empty and the tap water will simply be running out the drain?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Fill rate,

The question implies that the three openings were set open at the beginning of 8AM.