Multiple choice

A 450 m long train moving with the speed of 90 km/h crosses a platform in 30 seconds. A man crosses the platform in 2 minutes. What is the speed of the man?

  1. 1.5 m/s

  2. 4 m/s

  3. 2.5 m/s

  4. 6 m/s

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

First, convert the train's speed to m/s: 90 * 5/18 = 25 m/s. In 30 seconds, the train travels 25 * 30 = 750 m, which is the sum of the train's length and the platform's length, meaning the platform is 750 - 450 = 300 m long. Since the man crosses this 300 m platform in 2 minutes (120 seconds), his speed is 300 / 120 = 2.5 m/s.

Keep practicing — related questions