I'm a bit stuck on a homework question that I've been assigned. The question is as follows:
You are paddling a canoe at a speed of 4 km/h directly across a river that flows at 3 km/h. (a) What is your resultant speed relative to the shore? (b) In approximately what direction should you paddle the canoe so that it reaches a destination directly across the river?
Below the question is a little diagram of a canoe in a river, perpendicular to the shore, with an arrow pointing to the right, labelled 4 km/h, and an arrow pointed downwards, labelled 3 km/h.
I understand the first bit of the question, and have established that the resultant speed relative to the shore will be 5 km/h. Can you please help me with the second half?