Multiple choice

In what time a 300m long train running with the speed of 40 km/hr. crosses a person moving in the same direction with the speed of 4 km/hr.?

  1. 18 sec

  2. 12 sec

  3. 30 sec

  4. 20 sec

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed when moving in same direction = Speed of train - Speed of person = 40 - 4 = 36 km/hr. Convert to m/s: 36 × 5/18 = 10 m/s. Time = Distance / Speed = 300 / 10 = 30 seconds.