Multiple choice

Two trains are running in opposite direction with speeds 36 and 54 km. per hour. If the trains be of length 132 metres and 118 metres respectively, they will cross each other in-

  1. 10 sec.

  2. 8 sec.

  3. 12 sec.

  4. 14 sec.
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A Correct answer
Explanation

When trains move in opposite directions, their relative speed is the sum: 36 + 54 = 90 km/h. Convert to m/s: 90 × (5/18) = 25 m/s. Total distance to cross = sum of lengths = 132 + 118 = 250 m. Time = Distance / Speed = 250/25 = 10 seconds. The 8 second option would be correct if trains were moving in the same direction.

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