Multiple choice

A train travelling at 36 km/h crosses a pole in 25 seconds. How much time (in seconds) will it take to cross a bridge 350 m long?

  1. 72

  2. 48

  3. 60

  4. 56
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Train speed = 36 km/h = 36 * (5/18) = 10 m/s. Length of train = speed * time = 10 * 25 = 250 m. To cross a 350 m bridge, total distance = 250 + 350 = 600 m. Time = distance / speed = 600 / 10 = 60 seconds.

AI explanation

First convert the train's speed of 36 km/h to 10 m/s by multiplying by 5/18. The length of the train is 10 multiplied by 25 equals 250 m. The total distance to cross the bridge is the sum of the train and bridge lengths, 250 plus 350 equals 600 m. The required time is 600 divided by 10 equals 60 seconds.

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