At 10.00am, Mr Koh’s car passed a certain point, A, travelling at an average speed of 80km/h. At 11.30am, Mr Bob’s car started off from point A at an average speed of 100km/h in pursuit of Mr Koh’s car. a. At what time did Mr Bob’s car overtake Mr Koh’s car?
b. How far was Mr Bob’s car from point A when it overtook Mr Koh’s car?