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.
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