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An athlete crosses a 21 m wide river by swimming perpendicular to the water current at...

An athlete crosses a 21 m wide river by swimming perpendicular to the water current at a speed of 0.35 m/s relative to the water. He reaches the opposite side at a distance 38 m downstream from his starting point.

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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Thank you.please like the answer ASAP

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