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A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in ?
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- 16 hrs.
- 20 hrs.
- 25 hrs.
- 40 hrs.
Correct Option: D
Work done by leak in 1 hour = (1/8 - 1/10) = 1/40
∴ The leak will empty the cistern in 40 hours.
