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?
(A) 30kmh^{-1}
(B) 35kmh^{-1}
(C) 40kmh^{-1}
(D) 45kmh^{-1}
Answer : option (D)
Solution :
