Pipe A can fill a tank in 8 hrs and pipe B can empty it in 16 hrs. If both the pipes are opened simultaneously, how many hours will they take to fill up an empty tank?
Explanation:
Part filled by A in 1 hour = 1/8
Part emptied by B in 1 hour = 1/16
∴ Net filling in 1 hour = (1/8 - 1/16) = 1/16
∴ Tank full in 16 hours.
Hence, option (a).
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