Multiple choice

160 m. and 140 m. long two trains are moving on parallel tracks in opposite direction at the speed of 77 km./hr. and 67 km./hr. respectively. In what time they will cross each other?

  1. 4.5 seconds

  2. 5.5 seconds

  3. 6.5 seconds

  4. 7.5 seconds

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

When trains move in opposite directions, their relative speed is the sum of individual speeds. Convert 77 + 67 = 144 km/hr to m/s by multiplying by 5/18, giving 40 m/s. Total distance to cross is sum of train lengths: 160 + 140 = 300 m. Time = distance/speed = 300/40 = 7.5 seconds.

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