A water pipe has circular cross‑section of radius 0.15 m and carries water at a speed of 5 m/s. Find the volume of water that flows through the pipe in 30 s. Give your answer in litres. (Use π=3.14)

Step-by-step solution

1. Area of pipe cross‑section: $A=\pi r^2=3.14\times 0.15^2=0.07065{\text{m}}^2$
2. Volume per second: $V_s=A\times \text{speed}=0.07065\times 5=0.35325{\text{m}}^3/s$
3. Volume in 30 s: $V_{30}=0.35325\times 30=10.5975{\text{m}}^3$
4. Convert to litres: $10.5975\times 1000=10597.5\text{L}$
5. Round to nearest litre: 10600 L

Concept tested: Flow rate in a pipe

Published 16 October 2026 · How this solution was prepared and checked