A train covers a distance of 12 km in 10 min. If it takes 6 sec to pass a telegraph post, the length of the train is

90 m
100 m
120 m
140 m

Correct Answer: 120 m

Explanation:

Speed of the train = 12000 / 10*60 = 20 m/s

Length of the train = Speed X time = 20 X 6 = 120m

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