Multiple choice

A 100 m long train crosses a 10 m long bridge at a speed of 70 km/hr. How much time will it take to cross the bridge completely?

  1. 165 s

  2. 5.65 s

  3. 5.35.s

  4. 5.05.s
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To cross the bridge completely, the train must cover its own length plus the bridge length, 100 + 10 = 110 m. The speed is 70 km/h = 19.44 m/s, so the time is 110/19.44, approximately 5.65 seconds.

AI explanation

The total distance the train must cover to completely cross the bridge is the sum of its length and the bridge's length, which is 100 m + 10 m = 110 m. The speed of the train is given as 70 km/hr, which converts to m/s by multiplying by 5/18, yielding 350/18 m/s. The time taken is calculated by dividing the total distance by the speed, resulting in 110 divided by 350/18, which equals 110 multiplied by 18/350. This simplifies to 1980 / 350, resulting in a time of approximately 5.65 seconds.

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