If, when a motor boat moves along the river, its speed relative to the bank is 10 m / s

If, when a motor boat moves along the river, its speed relative to the bank is 10 m / s and when moving against the current, 6 m / s, then the boat’s speed in still water is.

Data: V1 (the speed at which the motor boat is moving relative to the coast along the current) = 10 m / s; V2 (speed when moving against the current) = 6 m / s.

Let’s make an equation for determining the speed of the boat in still water (V): Vк + V = V1; Vk – V = V2 and Vk + V – (Vk – V) = V1 – V2.

2V = V1 – V2 = 10 – 6 = 4.

V = 4/2 = 2 m / s.

Answer: The required boat speed in still water is 2 m / s.