Two cars are moving in the same direction with a speed of 30kmh−1 . They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 min. What is the speed of the third car?

Question : Two cars are moving in the same direction with a speed of 30kmh−1 . They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 min. What is the speed of the third car?