A tank has two pipes. The first pipe can fill it in 4 hours and the second can empty it in 16 hours. If two pipes be opened together at a time, then the tank will be filled in

A tank has two pipes. The first pipe can fill it in 4 hours and the second can empty it in 16 hours. If two pipes be opened together at a time, then the tank will be filled in
1). $5\frac{1}{2}$ hours
2). 10 hours
3). 6 hours
4). $5\frac{1}{3}$ hours

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