An athlete crosses a 21 m wide river by swimming perpendicular to the water current at a speed of 0.85 m/s relative to the water. He reaches the opposite side at a distance 39 m downstream from his starting point. w = 21 m d = 39 m vs = 0.85 m/s a) How fast is the water in the river flowing with respect to the ground in m/s? b) What is the speed of the swimmer with respect to a friend at rest on the ground in m/s?

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