Question

An inlet pipe 'M' can fill a tank in 'x' minutes while an outlet pipe 'N' can empty the fully filled tank in (x - 6) minutes. If both are opened together, they can empty fully filled tank in 72 minutes, then find the time taken by pipe 'M' alone to completely fill the tank.

A 18 minutes
B 20 minutes
C 22 minutes
D 24 minutes
E 30 minutes
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