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Question

A cistern is normally filled in 8 hrs, but it takes 2 hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in.

A
35 hours
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B
45 hours
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C
40 hours
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D
None of these
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Solution

The correct option is C 40 hours
Here, x = 8 and y = 8 + 2 = 10.
The leak will empty the cistern in

=(xyyx)hours

=(8×10108)hoursor,40hours


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