Multiple choice

A train running at a speed of $5m/s$ crosses a bridge $125$ m long in $80$ seconds. What is the length of the train in metres?

  1. $155$ m
  2. $165$ m
  3. $275$ m
  4. $180$ m
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C Correct answer
Explanation

Distance = Speed * Time = 5 m/s * 80 s = 400 m. This distance represents the length of the train plus the length of the bridge. Train length = 400 - 125 = 275 m.

AI explanation

The formula for a train crossing a bridge is total distance equals speed multiplied by time, where total distance is the train's length plus the bridge's length. Multiplying the speed of 5 m/s by the time of 80 seconds gives a total distance of 400 m. Subtracting the 125 m length of the bridge from this total distance leaves a train length of 275 m. The length of the train in metres is 275.

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