2015 · Q80
Water flows through a cylindrical pipe of internal diameter 7 cm at the rate of 5 m/s. The time, in minutes, the pipe would take tofill an empty rectangular tank 4 m x 3 m x 2'31 m i s
Elementary MathematicsMensuration
- A28
- B24
- C20
- D12
Explanation
Flow rate = π·3.5²·500 cm³/s; tank volume = 4×3×2.31 m³ = 27.72×10⁶ cm³; time ≈ 27.72×10⁶/(6125π) ≈ 1441 s ≈ 24 min (option B).