Question

Water is being pumped out through a circular pipe whose internal diameter is 7 cm. If the flow of water is 72 cm per second, how many litres of water are being pumped out in one hour?​

Answer 1

Answer:

Radius of pipe = 7/2 cm

Cross section Area =

$\pi \times {( \frac{7}{2}) }^{2} \: cm {}^{2}$

Volume of water pumped out in 1 sec. =

$\pi \times \frac{49}{4} \times 72 \: {cm}^{3}$

In one hour, volume of water comes out =

$\frac{22}{7} \times \frac{49}{4} \times 72 \times 3600 = \\ 22 \times 7 \times 18 \times 3600 \: cm {}^{3} = \\ \frac{22 \times 7 \times 18 \times 3600}{1000} \: litre = \\ 9979.2 \: \: \: litres \: \: ans.$