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UPSC 2017 CDS II Math Paper

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Question : 39

Total: 100

A tap can fill a tub in 10 hours. After opening the tap for 5 hours it was found that a small outlet at the bottom of the tub was open and water was leaking through it. It was then immediately closed. It took 7 hours to fill the tub after closing the outlet. What time will be taken by the outlet to empty the full tub of water ?

35 hours
25 hours
20 hours
17 hours

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