A boat is sent across a river with a velocity of 8 km h–1.

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A boat is sent across a river with a velocity of 8 km h^–1. If the resultant velocity of boat is 10 km h^–1 , then the velocity of the river is

1. 12.8 km h^–1
2. 6 km h^–1
3. 8 km h^–1
4. 10 km h^–1

Correct Option: B

v_r = √v_R² - v_B² = √10² - 8² = 6 km h^-1