A train is running at a speed of 40 km/hr and it crosses a post in 19.8 seconds. What is the length of the train?
Choose the most appropriate option:  A) 190 metres  B) 160 metres  C) 200 metres  D) 220 metres  E) 250 metres
Speed of the train, v = 40 km/hr = 40000/3600 m/s = 400/36 m/s   Time taken to cross, t = 19.8 s   220 metresistance Covered, d = vt = (400/36)Ã— 19.8 = 220 m   220 metresistance covered is equal to the length of the train = 220 m   Correct answer is 220 metres   220 metres
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A train is running at a speed of 40 km/hr and it crosses a post in 19.8 seconds. What is the length of the train?