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A rectangular water tank is 80 metre × 40 metre. Water flows into it through a pipe of 40 sq.cm at the opening at a speed of 10 km/hr. The water level will rise in the tank in half an hour by
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3 cm. 2 -
4 cm. 9 -
5 cm. 9 -
5 cm. 8
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Correct Option: D
Volume of water filled by pipe in 30 minutes
| = |  |  | cu.cm. | |
| 2 |
= 20000000 cu. cm.
| ∴ Height of water level = | = | cm. | ||
| 8000 × 4000 | 8 |
