Multiple choice

Two trains, 175 m and 225 m long, are running in opposite directions at 36 km/h and 54 km/h, respectively. In how much time will they cross each other?

  1. 18 seconds

  2. 16 seconds

  3. 20 seconds

  4. 22 seconds

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed of the first train (V) = 36 km/h = 36 * 5/18 = 10 m/s

Speed of the second train (v) = 54 km/h = 54 * 5/18 = 15 m/s

So, the time required to cross each other is, t = (L + l)/(V + v) 

t = (175 + 225)/(10 + 25) 

t = 16 seconds So, the required time is 16 seconds.

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