MAT Exam 2020 Paper

Concept:When two objects move in the same direction, their relative speed is the difference of their speeds.Explanation:Let the speed of the car be $x$ km/h.Speed of the pedestrian is $2$ km/h.Since both are moving in the same direction,relative speed of the car with respect to the pedestrian = $(x - 2)$ km/h.The car was visible for $6$ minutes = $\frac{6}{60} = \frac{1}{10}$ hour.The visible distance was $0.6$ km.So, relative speed $= \frac{0.6}{1/10} = 6$ km/h.Hence, $x - 2 = 6$, which gives $x = 8$ km/h.Answer:The speed of the car is $8$ km/h, i.e., option D.