A motorist travelling with a constant speed of 15 m/s

A motorist travelling with a constant speed of 15 m/s (about 34 mi/h) passes a school-crossing corner, where the speed limit is 10 m/s (about 22 mi/h). Just as the motorists pass, a police officer on a motorcycle stopped at the corner and starts off in pursuit with a constant acceleration of 3.0 m/s^2. a. How much time elapses before the officer catches up with the motorist? b. What is the officer's speed at that point? c. What is the total distance each vehicle has travelled at that point?