Question

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:
A.1(13/17) hours
B.2(8/11) hours
C.3(9/17) hours
D.4(1/2) hours

Answer 1

B Ok I Think this only