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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 - 5) 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 16 minutes

B 20 minutes

C 28 minutes

D 21 minutes

E 24 minutes

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