A ship sails north at 15 km/h but drifts westward with the tide at 8 km/h. What is the resultant velocity of the ship?

Help me Please

2 answers

draw a diagram of the velocities.

Recognize an 8-15-17 right triangle?
That is a right triangle:

speed=sqrt(15^2+8^2)
direction: arctan(8/15) W of N

That is a strong tide.