swimmer water speed V1 = 2 m / s, and he holds a course

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swimmer water speed V1 = 2 m / s, and he holds a course perpendicular to the coast. The flow rate of water in the river V2 = 1,5 m / s. The width of the river l = 60 m Find: a) the value of the speed V3 swimmer relative to the shore;. b) the angle a line between the shore and the vector of the velocity; c) The distance S along the shore, on which will carry for a swimmer to swim across the river.

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Task 10935. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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