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A tap can fill a tub in 10 hours. After ...

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?

A

35 hours

B

25 hours

C

20 hours

D

17 hours

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