In what time will they cross each other?

Two trains of lengths 150 m and respectively are running in opposite directions on parallel tracks. If their speeds be 50 km/hr and 58 km/hr respectively, in what time will they cross eachother?

  1. 15 seconds
  2. 30 seconds
  3. 11 seconds
  4. 22 seconds
Anurag Mishra Professor Asked on 29th December 2015 in Maths.
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1 Answer(s)

Answer is 11 seconds

Explanation:-
Let the time taken by two trains to cross each other be X sec. 

The speed of one train in m/sec = 50 x 5/18
 = 13.88 m/sec
The speed of another train in m/sec = 58 x 5/18
 = 16.11 m/sec

Time taken by trains to cross each other = (150 + 150)/(13.88 + 16.11)
 = 300/29.99
 = 10.003 sec

Hence, the correct answer is (3) 11 sec (Approximate) 

Monis Rasool Professor Answered on 29th December 2015.
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