Question

A tank can be filled by pipe M in 20 hours and by pipe N in 30 hours . Pipe O is 50% more efficient than pipe
M. Pipes N and O are opened when the tank is empty and turned off after 9 hours . How long will pipe M alone take to fill the remaining part?

A 1 hrs
B 0.5 hrs
C 2.5 hrs
D 5.4 hrs
E None of these
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