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Water is flowing at the rate of 3 km/hr through a circular pipe of 20 cm internal diameter into a circular cistern of diameter 10m and depth 2m. In how much time will the cistern be filled ?
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- 1 hour
- 1 hour 40 minutes
- 1 hour 20 minutes
- 2 hours 40 minutes
- 1 hour
Correct Option: B
Water flowed in 1 hour through the pipe
| = | × | m² = | m³ | |||
| 7 | 10000 | 7 |
Volume of circular/cylindrical cistern
| = | × 5 × 5 × 2 = | m³ | ||
| 7 | 7 |
| ∴ Required time = | = | hours | |||
| 7 | |||||
| 3 | |||||
| 7 | |||||
| or 1 hour | × 60 minutes | |
| 3 |
or 1 hour 40 minutes
