SOLUTION: A pool can be filled by one pipe in 12 hours and by a second pipe in 36 hours. How long will it take using both pipes to fill the pool?
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Question 435797: A pool can be filled by one pipe in 12 hours and by a second pipe in 36 hours. How long will it take using both pipes to fill the pool? Answer by htmentor(1343) (Show Source):
You can put this solution on YOUR website! The fill rate of pipe 1 = 1/12 pool/hr, and the fill rate of pool 2 = 1/36 pool/hr.
Working together, their combined rate is:
1/12 + 1/36 = 3/36 + 1/36 = 4/36 pool/hr
Taking the reciprocal gives 36/4 = 9 hr/pool
Ans: 9 hours
