Robin Banks robs and drives off.A short time later he passes a truck stop at which police officer willie katchup is dining. WIllie receives a call from his dispatcher and takes off in pursuit of Robin.Two minutes after he passes the truck stop Robin is 1.5km away. Willie takes off and six minutes after Robin passes he is 2 km from the truck stop. Seven minutes after Robin passed, Willie was 4 km from the truck stop.