Question

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

Answer 1

Step-by-step explanation:

• Area of cross section = 120m^2
• In one hour 2 km length of water will Fell into sea => 120 x 2000 m^3 = 240000m^3
• There for in one hour 240000/60 = 30000 m^3 of water
• ANSWER = 3 x 10^7 lits of water

Answer 2

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The river is 3m deep, 40m wide and is flowing at the rate of 2km\hour.

$\large\red{The \: length \: of \: water \: flow \: in \: 1min= \frac{2000}{60}}$

$\large\red{ = \frac{100}{3}m }$

$\large\red{Therefore, here \: l = \frac{100}{3}m,b =40m \: and \: h = 3m }$

$\large\red{Thus \: required \: volume \: of \: water= \: \frac{100}{3} \times 40 \times 3 }$

$\large\red{ = 4000 {m}^{3} }$

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