Multiple choice

A train running at a speed 36 km/hr cuts a laser beam perpendicularly and crosses it in 20 sec. What is the length of the train?

  1. 50 m

  2. 200 m

  3. 300 m

  4. 100 m
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed = 36 km/hr = 36 * (5/18) = 10 m/s. Distance = Speed * Time = 10 m/s * 20 s = 200 m.

AI explanation

Convert the speed from 36 km/hr to m/sec using the 5/18 conversion factor, resulting in 10 m/sec. The formula for distance is speed multiplied by time. Multiplying 10 m/sec by 20 seconds gives a length of 200 m. The length of the train is 200 m.

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