Question

4. In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area
of the valley is 7280 km², 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.​

Answer 1

Answer:

Volume of rainfall in the area = 7280×10×0.00001=0.728 km

3

Volume of water in 3 rivers =3×1×b×h=3×1072×75×0.001×3×0.001=0.723 km

3

(Converted m = km)

So, the 2 valleys are nearly similar........