Question: A cistern can be filled with water by a pipe in 6 hours and it can be emptied by the second pipe in 4

A cistern can be filled with water by a pipe in 6

A cistern can be filled with water by a pipe in 6 hours and it can be emptied by the second pipe in 4 hours. If both pipes are opened when the cistern is full, the time in which it would be empty is : 1. 10 hours 2. 12 hours 3. 14 hours 4. 16 hours None of these 5.

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