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In one for night of a given month, ther...

In one for night of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 97280 `km^2`, show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long, 75 m wide and 3 m deep.

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The correct Answer is:
`97280km^(2)`
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