state gov WBPSC Food SI Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern

A cistern which could be filled in 9 hours takes one hour more to be filled owing to a leak in its bottom. If the cistern is full, in what time will the leak empty it?

1

30 hours

2

60 hours

3

90 hours

4

12 hours

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