Question

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?
​

Answer 1

in 1 min water will travel 2× (1/60) km = 1/30 km = 100/30 m.

therefore, volume of water will be

= 3×40×(100/30) = 400 m^3

Answer 2

AnswEr:

We have ,

• Width of the river = 44 m
• Depth of the river = 3 m

If l meter is the length of the river , then water in the river forms a cuboid of width 40 metres and height of 3 metres.

__________________________

• The length of the cuboid is equal to the distance travelled by water in one minute with the speed of 2 km per hour.

•°• $\sf\red{Length\:of\:the\:cuboid-}$

$\sf = \frac{2000}{60} \: metres = \frac{100}{3} \: metres$

•°• $\sf\pink{Volume\:of\:the\:water-}$

$\sf = \frac{100}{3} \times 40 \times 3 \: {m}^{3} = 4000 \: {m}^{3} \\ \\ \sf = 4000000 \: litres$

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