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A Boy and girl together fill a cistern with water. The boy pours 4 litres of water every 3 minutes and the girl pours 3 litres every 4 minutes. How much time will it take to fill 100 litres of water in the cistern ?
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- 36 minutes
- 42 minutes
- 48 minutes
- 44 minutes
- 36 minutes
Correct Option: C
On the basis of given details in question ,
| Water filled by the boy in 1 minute = | ||
| 3 |
| Water filled by a girl in 1 minute = | ||
| 4 |
| Water filled by the boy and girl in 1 minute = | + | = | = | litres | ||||
| 3 | 4 | 12 | 12 |
| ∴ Time taken to fill 100 litres = | × 12 = 48 minutes | |
| 25 |
