The river’s velocity, vr, is 3 meters per second.
vs = 4 m/s is the speed of the swimmer.
a) When the swimmer swims due north, the y-component will have a velocity of 4 meters per second and the x-component will have a velocity of 3 meters per second. As a function of tan, the following is the resultant velocity.
Here, θ = 37oN
If the swimmer intends to reach the place that is exactly opposite him and that is with regard to tan, the following is the consequent speed of the swimmer.
So, of north