One motor pump can fill a gram panchayat tank in 55 hours and a second pump can fill it in 66 hours. If both run together, after how many hours will the tank be full?

Question

Accepted Answer

30. Combined rate = 1/55 + 1/66 = (6 + 5)/330 = 11/330 = 1/30 tank per hour, so they need 30 hours.

One motor pump can fill a gram panchayat tank in 55 hours and a second pump can fill it in 66 hours. If both run together, after how many hours will the tank be full?

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