Question

Pipe L can empty the tank which is 45% filled in 9 hours. The time taken by pipe K and J together to fill an empty tank completely in 7.5 hours. Pipe J alone can fill an empty tank completely in (z-5) hours. The ratio between the efficiencies of pipe J and M is 3:2 respectively. The efficiency of pipe K is one third of the efficiency of pipe J. Find out the value of ‘z’. It is assumed that except pipe L, none of the pipe is used to empty the tank.

A 12
B 16
C 25
D 18
E None of the above
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