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New type of pump can drain a certain pool in 5 hours. an older pump can drain the pool in 15 hours. how long will it take both pumps working together to drain the pool?
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Sep 22, 2019
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New type of pump can drain a certain pool in 5 hours. an older pump can drain the pool in 15 hours. how long will it take both pumps working together to drain the pool?
Mathematics
high-school
Prakhar Jhudele
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Prakhar Jhudele
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New pump:
5 hours = 1 pool
1 hour = 1/5 pool
Old pump:
15h = 1 pool
1h = 1/15 pool
If both work together
1h = 1/5 + 1/15 = 4/15 pool
4/15 pool = 1 hour
1/15 pool = 1/4 hour
15/15 pool = 1/4 x 15
1 pool = 3.75 hours or
3 hours 45 mins
Luke Cowell
answered
Sep 25, 2019
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Luke Cowell
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