Question

Question 99

A river 2 m deep and 45 m wide is flowing at the rate of 3 km per hour. Find the amount of water in cubic metres that runs into the sea per minute.

Answer 1

Depth of the river = 2 m
Width of the river = 45 m
Flowing rate of the water = 3 km/h
$=3\times \frac{1000}{60}=\frac{3000}{60}$ [$\because$ 1 km = 1000 m and 1 h = 60 min]
$=\frac{300}{6}=50m/min$
The amount of water into sea per minute
$=Depth\times Width\times Lengthofwaterof1min=2\times 45\times 50=4500m^3/min$