A tank can be filled by pipe A in 5 hours and emptied by pipe B in 8 hours respectively. How much time will it take for the tank to be half full?

A tank can be filled by pipe A in 5 hours and emptied by pipe B in 8 h

1.	A tank can be filled by pipe A in 5 hours and emptied by pipe B in 8 hours respectively. How much time will it take for the tank to be half full?
A.	\(3\frac{1}{3}{\rm{h}}\)
B.	\(8\frac{2}{3}{\rm{h}}\)
C.	\(12\frac{1}{3}{\rm{h}}\)
D.	\(6\frac{2}{3}{\rm{h}}\)
Answer» E.

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A tank can be filled by pipe A in 5 hours and emptied by pipe B in 8 hours respectively. How much time will it take for the tank to be half full?

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