Next-door neighbors Bob and Jim use hoses from both houses to fill Bob's swimming pool. They know that it takes 24 h using both hoses. They also know that Bob's hose, used alone, takes 20% less time than Jim's hose alone. How much time is required to fill the pool by each hose alone?

Question

Physics

Maximillian Cantrell

15 November, 15:14

Next-door neighbors Bob and Jim use hoses from both houses to fill Bob's swimming pool. They know that it takes 24 h using both hoses. They also know that Bob's hose, used alone, takes 20% less time than Jim's hose alone. How much time is required to fill the pool by each hose alone?

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Answers (1)

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Camilla Lin · Answer 1

Answer: fill the pool with Bob's hose: 43,2 hours and 54 hours for the Jim's hose

Explanation:

It is known that the two hoses took 24 hours to fill the pool and that Bob's hose is 20% faster than Jim's, then each hose filled a volume in 24 hours totaling the total volume of the pool. then Bob's hose takes 24 hours minus 20% to fill the volume that Jim's hose completed, that is, 24h * 0.8 = 19.2 hours, so, using Bob's hose, it would take 24h plus 19.2h = 43.2 hours to fully complete the pool. on the other hand it is known that Bob's hose is 20% faster than Jim's, so 43.2 hours will be 80% of the time it would take Jim's hose to complete the pool filling, then 43.2 * 100/80 = 54 hours it would take Jim's hose to completely fill the pool.