Rower A is stationary at the point A adjacent to the river bank when he spots an object floating down the river. He estimates that the object is 50m away and heading south at a speed of 3m/s (the same speed as the current) see diagram below.

Assuming rower A can sustain a rowing speed of 4m/s

1 Draw a diagram of the velocity vectors involved if rower a is to intercept the object

2 calcuate the direction with respect to the river bank he needs to row (in degrees) in order to achieve his goal.

Now part 1 of the question i know how to do, but with part 2 i'm stuck, not really sure where to begin. If someone could just give a few hints then hopefully I can take it from there.

Many thanks