Filling an irrigation tank takes 27 hours with the canal inlet alone and 54 hours with the borewell pump alone. Using both together, how many hours will the empty tank take to fill?

Question

Accepted Answer

18. Combined rate = 1/27 + 1/54 = (2 + 1)/54 = 1/18 of the tank per hour, so 18 hours.

Filling an irrigation tank takes 27 hours with the canal inlet alone and 54 hours with the borewell pump alone. Using both together, how many hours will the empty tank take to fill?

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