How Much Time will Take Both to Cross Each Other?

Two trains each 220 m long are travelling at 45km/h and 54km/h in opposite directions. They will cross each other in

  1. 12sec.
  2. 18 sec.
  3. 16 sec.
  4. 24 sec.
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1 Answer(s)

Answer: (3) 16 sec.
Explanation:-

Two trains each 220 m long.
Speed of first train = 45km/h = 45 x 5/18 = 25/2m/s
Speed of other train = 54km/h = 54 x 5/18 = 15 m/s.
Total distance covered by both trains  = 220 + 220  = 440 m.

They will cross each other = 440/ (25/2 + 15)
= 440 x 2 /55
= 16sec.

Hence, they will cross each other in 16 sec.

Anurag Mishra Professor Answered on 3rd June 2015.
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