The speed of the boat relative to the water is 18 km / h and the speed of the water flow in the river is 2 m / s at what speed does the boat go against the current? What is its movement in 20 minutes?
These tasks: Vк (speed of a given boat relative to the water) = 18 km / h = 5 m / s; Vt (water flow speed) = 2 m / s; t is the considered travel time (t = 20 min = 1200 s).
1) The speed with which the boat goes against the current: V = Vk – Vt = 5 – 2 = 3 m / s.
2) Moving the boat in 20 minutes: S = V * t = 3 * 1200 = 3600 m = 3.6 km.
Answer: In 20 minutes, a given boat will cover a distance of 3.6 km, and its speed is 3 m / s.
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