Multiple choice

A train running at the speed of 80 km/h crosses a 350 m long tunnel in 36 seconds. The length of the train (in m) is

  1. 350

  2. 380

  3. 420

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

Speed = 80 km/h = 80 * (5/18) m/s = 200/9 m/s. Distance = Speed * Time = (200/9) * 36 = 800 meters. This distance is the sum of the train length and the tunnel length. Train length = 800 - 350 = 450 meters.

AI explanation

First, convert the speed from km/h to m/s using the formula 80 multiplied by 5/18, which gives 200/9 m/s. The total distance covered is speed multiplied by time, so 200/9 multiplied by 36 equals 800 meters. Subtracting the tunnel length of 350 meters from this total distance gives a train length of 450 meters.

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