Multiple choice

A 200 metre long train is running at a speed of 72 km/hr. How long will it take to cross a 800 metre long bridge?

  1. 50 seconds

  2. 40 seconds

  3. 60 seconds

  4. 30 seconds
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A Correct answer
Explanation

Total distance = 200m + 800m = 1000m = 1 km. Speed = 72 km/hr = 20 m/s. Time = 1000m / 20 m/s = 50 seconds.

AI explanation

The total distance the train must cover to cross the bridge is its own length plus the bridge's length, which is 200 m plus 800 m, totaling 1000 m. The train's speed in meters per second is 72 km/hr multiplied by 5/18, yielding 20 m/s. The time taken is the total distance divided by the speed, calculated as 1000 m divided by 20 m/s, resulting in 50 seconds.

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