Question

From a tap of inner radius 0.75 centimetre water flows out at the rate of 0.75 metre per second. calculate the volume litres of water delivered by the pipe in 30 minutes?

Answer 1

Volume of water flowing out of the tap in 1 s = $\frac{22}{7}\times 0.75\times 0.75\times 75{\mathrm{cm}}^3$ (1 m = 100 cm)
30 min = 30 × 60 s = 1800 s

Volume of water flowing out of the tap in 30 min (or 1800 s) = $\frac{22}{7}\times 0.75\times 0.75\times 75\times 1800{\mathrm{cm}}^3$
∴ Volume of water in litres delivered by the pipe in 30 min

= $\frac{22}{7}\times 0.75\times 0.75\times 75\times 1800\times 0.001l\approx 238.66l\left(1{\mathrm{cm}}^3=0.001l\right)$