Multiple choice

A 150 meter long train is running at a speed of 75 km. /hr. In how many seconds it will cross a 90 meter long train running in the opposite direction at a speed of 45 km. /hr.?

  1. 15.2 sec.

  2. 12.4 sec.

  3. 10.3 sec.

  4. 7.2 sec.

  5. 6.1 sec.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total distance = 150 + 90 = 240 m. Relative speed when moving opposite = 75 + 45 = 120 km/hr = 120 × (5/18) = 33.33 m/s. Time = Distance/Speed = 240/33.33 = 7.2 seconds. Option D is correct. This uses relative speed concept and unit conversion.

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