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RRB ALP CBT I Exam 13-Aug-2018 Shift 1 Solved Paper

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Question : 8

Total: 75

Pipe A can empty a filled tank in 28 hours while Pipe B can fill the same tank, when empty, in 35 hours. If alternately Pipes A and B are turned on for an hour each time, starting when the tank is full, how long will it take to empty the tank?

279 hours
271 hours
275 hours
280 hours

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