Two cars, a poeche boxster convertible and a toyota scion xB,are travelling in the same direction,?

although the Boxster is 186m behind the scion. the speed of the boxster is 24.4m/s and the speed of scion is 18.6m/s. how much time does it take for the boxster to catch Scion?(Hint: What must be true about the displacement of the two cars when they meet?)