Question

An athlete crosses a 21 m wide river by swimming perpendicular to the water current at a speed of 1.1 m/s relative to the water.

How fast is the water in the river flowing with respect to the ground in m/s?
bobpursley
How long did it take him to get across? More information is needed.
This is online homework. This is all the information given with Part B asking the speed of the swimmer.

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