NCERT Solutions for Class 10 Maths Chapter 13 - Surface Areas and Volumes

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Chapter 13 - Surface Areas and Volumes Exercise Ex. 13.5

Solution 1

Rainfall in the valley = 10 cm = 0.1 m

Area of the valley = 7280 km2 = 7280000000 m2

Volume of rain water = 7280 × 10 × 1/1,00,000 = 0.7280 km3

Volume of three rivers = 3 × 1072 × 75/1000 × 3/1000 = 0.7236 km

Hence, the two are approximately equivalent.

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