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Pipe A can fill a cistern in 6 hours and pipe B can fill it in 8 hours. Both the pipes are opened simultaneously, but after two hours, pipe A is closed. How many hours will B take to fill the remaining part of the cistern ?
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- 2 hrs
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3 1 hours 3 -
2 2 hours 3 - 4 hrs
Correct Option: B
On the basis of given details in question ,
| Part of the cistern filled in 2 hours by pipe A and B = 2 |  | + |  | = 2 | | | = | ||||
| 6 | 8 | 24 | 12 |
| Remaining part = 1 - | = | ||
| 12 | 12 |
| ∴ Time taken by pipe B in filling 5/12 part = | × 8 = | = 3 | hours. | |||
| 12 | 3 | 3 |
