Explanation:- Length of the train = 150 m
Speed of the man = 2 km/hr
Relative speed = 150/3 = 50 m/s = 50 × 18/5 = 180 km/hr
Relative speed = Speed of train - Speed of the man (as both are moving in the same direction).
Therefore, Speed of the train = Relative speed + Speed of the man = 180 + 2 = 182 km/hr