A Minibus driver traveling at a constant 15 m/s passes a school crossing where the speed limit is 10 m/s. Just as the Minibus passes the school-crossing sign, a police officer on a motorcycle stopped there starts in pursuit with constant acceleration 3.0 m/s². a) How much time elapses before the officer passes the Minibus driver? At that time, b) What is the officer's speed? c) How far has each vehicle travelled? d) Draw a velocity-time graph for this situation.​