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Question

Pipes A and B can fill a tank in 12 minutes and 15 minutes, respectively, while outlet pipe C can empty the entire tank in 1 hour. All three pipes are open for 'x' minutes, after which pipe A and pipe C are closed. If the tank is completely filled in 10 minutes, find the value of 'x'.

A 4 minutes

B 5 minutes

C 3 minutes

D 6 minutes

E None of these

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