Multiple choice

A train, 270 metres long, is running at a speed of 36 km/hr. It will cross a bridge of length 180 metres in

  1. 40 sec

  2. 45 sec

  3. 50 sec

  4. 35 sec
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance = 270 + 180 = 450 m. Speed = 36 km/hr = 10 m/s. Time = 450 / 10 = 45 seconds.

AI explanation

First, convert the speed of the train from kilometers per hour to meters per second using the conversion factor 5/18, which gives 36 multiplied by 5/18 equal to 10 m/s. The total distance the train must cover to cross the bridge is the sum of its own length and the bridge's length, resulting in 270 plus 180 equal to 450 meters. Using the formula time equals distance divided by speed, the time taken is 450 divided by 10, which equals 45 seconds.

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