Question

Water in a canal, 5.4 m wide and 1.8 m deep, is flowing with a speed of 25 km/hour. How much area can it irrigate in 40 minutes, if 10 cm of standing water is required for irrigation?

Answer 1

Speed of water $=25km/hr=\frac{25\times 1000}{360}m/min=\frac{1250}{3}m/min$

In $40$ min, total volume transported $=5.4\times 1.8\times \frac{1250}{3}\times 40=162000m^3$

$\Rightarrow Area=\frac{Vol}{height}=\frac{162000}{10\times {10}^{-2}}=1620000m^2$