Question:A river `1.5 m`deep and `36` m wide is flowing at the rate of `3.5` km per hour. The amount of water that runs into the sea per minute ( in cubic metres) is : 

A `3150` 
B `31500` 
C `6300` 
D `63000` 

+ Answer
A 

+ Explanation
Length of water column flower in `1` min.

`= ((3.5 xx 100)/(60)) m`

`= 175/3 m.`

:. Volume flower per minute

`= (175/3 xx 36 xx 3/2) cu. m`

`= 3150 cu. m.`

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Irin Moni

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