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A cistern has two pipes. One can fill it with water in 8 hours and other can empty it in 5 hours. In how many hours will the cistern be emptied if both the pipes are opened together when 3/4 of the cistern is already full of water ?
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13 1 hours 3 - 10 hours
- 6 hours
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3 1 hours 3
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Correct Option: B
On the basis of given details in question ,
| Part of cistern emptied in 1 hour = | - | = | = | ||||
| 5 | 8 | 40 | 40 |
| ∵ | part is emptied in 1 hour. | |
| 40 |
| ∴ | part is emptied in | × | = 10 hours. | |||
| 4 | 3 | 4 |
