2026 · Q60
A tall cylindrical reservoir kept vertically is 20 m in diameter. Water is poured into it at the rate of 264 m³ per hour. What is the rate at which the water level rises in the reservoir per minute? (Take π = 22/7)
Elementary MathematicsMensuration
- A1.0 cm
- B1.2 cm
- C1.4 cm
- D14 cm
Explanation
The reservoir radius is 10 m. The water level rises by volume/area = 264/(π·100) = 264/314.29 ≈ 0.84 m = 84 cm per hour. Per minute that is 84/60 = 1.4 cm, option C.