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A vessel can be filled by one pipe in 12 minutes and emptied by another in 8 minutes. If the vessel full and both the pipes are open, then in how much time will the vessel be empty?

A.	30 min	B.	16 min
C.	48 min	D.	24 min

Answer and Explanation

Answer:24 min

Explanation:
Let it take as x hours for the vessel to be emptied.
x(1/8 – 1/12) = 1
x(3 – 2)/24 = 1
x = 24 mins

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