Answer :

Area of the valley = 7280 km2

If there was a rainfall of 10 cm in the valley then amount of rainfall in the valley = area of the valley × 10 cm

Amount of rainfall in the valley = 7280 km2× 10 cm

[As 1 km = 1000 m = 100000 cm ]


Amount of rainfall in one day 

= 0.728 km3  ------ [i]


Length of each river, l = 1072 km

The breadth of each river, b = 75 m


Depth of each river, h = 3 m



The volume of each river = l × b × h





= 0.2412 km3

Volume of three such rivers = 3 × Volume of each river

= 3 × 0.2412 km3
= 0.7236 km3        ------   [ii]


[i] and [ii] are approximately equal.

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