An athlete crosses a 25-m-wide river by swimmingperpendicular to the water current at a speed of 0.5 m/srelative to the water. He reaches the opposite side at adistance 40 m downstream from his starting point. How fast isthe water in the river flowing with respect to the ground? Whatis the speed of the swimmer with respect to a friend at rest onthe ground?

Question

An athlete crosses a 25-m-wide river by swimming
perpendicular to the water current at a speed of 0.5 m/s
relative to the water. He reaches the opposite side at a
distance 40 m downstream from his starting point. How fast is
the water in the river flowing with respect to the ground? What
is the speed of the swimmer with respect to a friend at rest on
the ground?

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