(chatquestion)...25. A train passes a platform with a uniform speed. A boy standing on the platform decides to estimate length of a coach and speed of the train. For this purpose, he first runs with a constant speed of u = 10 km/h in the direction of the motion of the train and passes by a coach in n1= 30 steps. Then he turns back, runs at the same constant speed and passes by a coach in n2 = 20 steps. If the boy covers a distance l = 1.0 m in each step, answer the following questions. (a) What is the speed of the train? (b) What is the length of a coach?...(Photo from Swarnalatakabi)

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