Multiple choice

A train traveling at a speed of 60 km per hour overtakes a motorbike running at 30 km per hour in 30 seconds. The length of the train is

  1. 150 m

  2. 250 m

  3. 350 m

  4. 450 m
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = 60 - 30 = 30 km/hr = 30 * 5/18 m/s = 150/18 = 25/3 m/s. Distance = Speed * Time = (25/3) * 30 = 250 m.

AI explanation

Using the relative speed formula for objects moving in the same direction, the relative speed is 60 kmph minus 30 kmph, which equals 30 kmph. Converting this to meters per second gives 30 multiplied by 5/18, resulting in 25/3 m/s. The length of the train equals the relative speed multiplied by the overtaking time, so multiplying 25/3 by 30 seconds gives a length of 250 m.

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