Multiple choice

A train, 260 m long, meets a man going in the opposite direction running at 8 km/h. The train passes the man in 20 seconds. Find the speed of the train.

  1. 38 km/h

  2. 38.5 km/h

  3. 40 km/h

  4. 40.5 km/h

  5. None of these

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B Correct answer
Explanation

Length of the train (L) = 260 m

Speed of the man (v) = 8 km/h = 8 * 5/18 = 20/9 m/s

Speed of the train = V km/h

So, t = L/(V + v)

20 = 260/(V + 20/9)

= 97/9 m/s

= (97/9) * (18/5) = 38.5 km/h