Multiple choice

A train of length 450 m crosses a bridge of length 150m in 24 seconds. What is the speed of train?

  1. 22.5 km/hr

  2. 67.5 km/hr

  3. 90 km/hr

  4. None of these
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C Correct answer
Explanation

Total distance = 450 + 150 = 600 m. Time = 24 s. Speed = 600 / 24 = 25 m/s. Convert to km/hr: 25 * (18/5) = 90 km/hr.

AI explanation

The total distance the train must cover to cross the bridge is the sum of its length and the bridge's length: 450 m + 150 m = 600 m. The speed of the train is calculated as Distance divided by Time, giving 600 m / 24 seconds = 25 m/s. Converting this to km/hr using the factor 18/5, we get 25 x (18/5) = 90 km/hr. The result is 90 km/hr.

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