Multiple choice

A train 50 m long passes over a bridge at a velocity of 36 km/h. If it takes 35 s to cross the bridge, the length of the bridge will be

  1. 100 m

  2. 200 m

  3. 250 m

  4. 300 m
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Convert speed to m/s: 36 km/h = 10 m/s. Total distance covered = speed * time = 10 * 35 = 350 m. Since the total distance is the sum of the train length and bridge length, bridge length = 350 - 50 = 300 m.

AI explanation

First, convert the train's speed from km/h to m/s by multiplying by 5/18, giving a speed of 36 * (5/18) = 10 m/s. The total distance the train covers to pass completely over the bridge is the speed multiplied by the time, which is 10 m/s * 35 s = 350 m. Since the total distance equals the length of the train plus the length of the bridge, the bridge's length is 350 m - 50 m = 300 m.

Keep practicing — related questions