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RRB Group D 17-Sep-2018 Shift 1 Solved Paper

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Question : 55

Total: 100

Inlet Pipe A can fill a cistern in 32 hours, whereas outlet Pipe mathrm‌B can drain the filled cistern in 40 hours. The two pipes are opened together when the cistern is empty, but the outlet pipe is closed when the cistern is three-quarters full. How many hours will it take in all to fill the cistern?

128
62
80
120

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