this question is from my grade 12 calculus class I tried working it out but am having trouble drawing a correct diagram, which is the most important step for solving.

A power boat travels west at 24 km/h. At the instant it passes a buoy, a sailboat sailing north at 7 km/h is 25 km south of the buoy. Calculate the positions of the vessels when there is a minimum distance between them.

It would help if someone could help with the diagram to help get me started.