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Question

Pipe A can fill a tank in 12 hours, pipe B in 15 hours, and an outlet pipe C can empty a full tank in 10 hours. All three are opened together. After 3 hours, pipe C is closed. How much more time will A and B take to fill the tank completely?

A 15/5 hrs

B 17/3 hrs

C 21/8 hrs

D 33/5 hrs

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