Two pipes A and B can fill a cistern in ...

Two pipes A and B can fill a cistern in 15 hours and 10 hours respectively. A tap C can empty the full cistern in 30 hours. All the three taps were open for 3 hours, when it was remembered that the emptying tap had been left open. It was then closed. How many hours more would it take for the cistern to be filled?

3 hr 30 min

3 hr 36 min

4 hr 35 min

None of these

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