May I please receive help with this problem with written work? I understand I need to use the Pythagorean theorem, but I don't know what else to do from there.

12. Two roads intersect at right angles. You are standing 25 meters north of the intersection on one of the roads. You are watching a car traveling west at 30 meters per second. At how many meters per second is the car traveling away from you 3 seconds after it passes through the intersection? (A) 23-047 (B) 28.906 (C) 29.032 (D) 30