Multiple choice

A 450 metre long train crosses a bridge 650 metre long in 36 seconds. What is the speed (in km/hr) of the train?

  1. 110

  2. 125

  3. 150

  4. 95
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A Correct answer
Explanation

Total distance = 450 + 650 = 1100 m. Time = 36 s. Speed = 1100 / 36 m/s. Convert to km/hr: (1100 / 36) * (18 / 5) = 1100 / 10 = 110 km/hr.

AI explanation

The total distance covered is the sum of the train's length and the bridge's length, which is 450 m plus 650 m, totaling 1100 m. The speed in meters per second is this distance divided by the time, giving 1100 m divided by 36 s, which equals 275/9 m/s. To convert to km/hr, multiply by 18/5, resulting in a speed of 110 km/hr.

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