Q : 9     A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?
 

Answers (1)

Given,
Rate of water flow = 2\ km\ per\ hour
= \frac{2\times1000}{60}\ m/min
= \frac{100}{3}\ m/min
Depth of river, h = 3\ m
Width of the river, b= 40\ m
The volume of water flowing in 1 min = Rate\ of\ flow \times Cross\ sectional\ area

= \frac{100}{3}\times40\times3

= 4000\ m^3

Therefore, water falling into the sea in a minute = 4000\ m^3

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