Question

An inlet pipe 'P' can fill a tank in 'x' minutes while an outlet pipe 'Q' can empty the fully filled tank in (x - 7) minutes. If both are opened together, they can empty fully filled tank in 84 minutes, then find the time taken by pipe 'P' alone to completely fill the tank.

A 21 minutes
B 24 minutes
C 26 minutes
D 28 minutes
E 35 minutes
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