Multiple choice

The length of the train is 300 m., and it is moving with the speed of 108 km/hr. In what time will it cross the man moving the direction opposite to it at the speed of 12 km/hr?

  1. 12 sec

  2. 10 sec

  3. 15 sec

  4. 9 sec

  5. 18 sec
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When two objects move in opposite directions, their relative speed is the sum of their individual speeds. Here, relative speed = 108 + 12 = 120 km/hr. Convert to m/s: 120 × (5/18) = 100/3 m/s. Time = Distance/Speed = 300 ÷ (100/3) = 9 seconds. The train's length is the distance to be covered relative to the man.

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