Vector question (relative speed)

A plane goes from city A to city B. In a Cartesian plane, city A is at the origin and city B has coordinates (100,150). If there is no wind, the flight lasts one hour. Unfortunately, there is a wind. If the pilot does not adjust his flight path, he will be at point (120,160) after an hour. What is the speed of the wind?

I am having trouble doing this question, and my teacher has warned there will be a question similar to this on our test. I would like to know the steps I need to take in order to solve this question.