Moving down the river, the boat passes 500 m in 50 seconds. The river speed is 2 m / s. Find the speed of the boat in still water.

Initial data: S (distance that the boat traveled down the river) = 500 m; t (duration of boat movement) = 50 s; Vр (river flow speed) = 2 m / s.
The speed of the boat in still water can be expressed from the equality: S / t = V = Vк + Vр, whence Vк = S / t – Vр.
Calculation: Vк = 500/50 – 2 = 10 – 2 = 8 m / s.
Answer: The boat in still water will move at a speed of 8 m / s.