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The rain water from a roof 22 m × 20 m drains into a cylindrical vessel having a diameter of 2 m and height 3.5 m. If the vessel is just full, then the rainfall (in cm) is :
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- 2
- 2.5
- 3
- 4.5
- 2
Correct Option: B
Let amount of rainfall be 'x'
| 20 × 20 × x = | × 1² × 3.5 | |
| 7 |
| ⇒ x = | = 0.025 metre = 2.5 cm | |
| 7 × 22 × 20 |
