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Two pipes, P and Q, together can fill a cistern in 20 minutes and P alone can in 30 minutes. Then Q alone can fill the cistern in
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- 62 minutes
- 60 minutes
- 61 minutes
- 51 minutes
- 62 minutes
Correct Option: B
According to question ,
| Part of the cistern filled by pipe Q in 1 minute = | - | = | = | ||||
| 20 | 30 | 60 | 60 |
∴ Required time = 60 minutes
