Find Out the Speed of Each Train (in kmph):

Two trains are running in opposite directions with the same speed. If the length of each train is 120 metre and they cross each other in 12 seconds, then the speed of each train (in kmph) is:

  1. 72
  2. 36
  3. 18
  4. None of these
Desire Adnan Default Asked on 3rd August 2015 in Maths.
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1 Answer(s)

Answer: (1) 72 km/hr
Let the speed of the train be X m/sec
The speed of the train = (sum of the length of the train )/  time taken by train to cross each-other

Then, the speed of the train = (120 + 120 )/12  (The length of both trains are equal )
= 240/12
= 20 m/sec
Speed in  km/hr = 20 x 18/5
= 4 x 18
= 72 km/hr
Then, the speed of each train is 72 km/hr.
Hence, the answer is (1) 72 km/hr.

Anurag Mishra Professor Answered on 4th August 2015.
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