Two pipes A and B can fill an empty tank in 10 hours and 16 hours respectively. They are opened alternately for 1 hour each, starting with pipe A first. In how many hours, the empty tank will be filled?

Two pipes A and B can fill an empty tank in 10 hours and 16 hours resp

1.	Two pipes A and B can fill an empty tank in 10 hours and 16 hours respectively. They are opened alternately for 1 hour each, starting with pipe A first. In how many hours, the empty tank will be filled?
A.	\(12\frac{1}{3}\)
B.	\(12\frac{1}{8}\)
C.	\(12\frac{1}{4}\)
D.	\(12\frac{1}{6}\)
Answer» D. \(12\frac{1}{6}\)