3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
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3 pumps, working 8 hours a day, can empty a tank in 2 days.
let 4 pumps, working x hours a day, can empty a tank in 1 days.
So 3*8*2 = 4*x*1
⇒ 4x = 48
⇒x = 48/4 = 12 hours a day.
They must work 12 hours a day.
let 4 pumps, working x hours a day, can empty a tank in 1 days.
So 3*8*2 = 4*x*1
⇒ 4x = 48
⇒x = 48/4 = 12 hours a day.
They must work 12 hours a day.
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