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Question
A river 1.5 m deep and 36 m wide is flowing at the rate of 3.5 km/hr. Find the amount of water (in cubic metres) that runs into the sea per minute.
Solution
We have,
Depth of the river, h = 1.5 m,
Width of the river, b = 36 m,
Speed of the flowing water,` l = 3.5 "km"//"hr" =(3.5xx1000 "m")/(60 "min") = 175/2 "m"//"min"`
Now,
The amount of water that runs into sea per minute = lbh
`=175/3xx36xx1.5`
= 3150 m3 / min
So, the amount of water that runs into the sea per minute is 3150 m3.
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