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Question

An inlet pipe 'A' can fill a tank in 'x' minutes while an outlet pipe 'B' can empty the fully filled tank in (x - 4) minutes. If both are opened together, they can empty fully filled tank in 45 minutes, then find the time taken by pipe 'A' alone to completely fill the tank.

A 12 minutes

B 15 minutes

C 18 minutes

D 20 minutes

E 10 minutes

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