Multiple choice

A 1250 m long train covers a distance of 1 km in 2 minutes. It crosses another stationary train in 4 minutes. The length of stationary train is:

  1. 1250 m

  2. 500 m

  3. 750 m

  4. 1000 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Train speed = 1 km / 2 min = 0.5 km/min = 500 m/min. Length = 1250 m. Crossing stationary train: (1250 + L) / 500 = 4 min. 1250 + L = 2000. L = 750 m.

AI explanation

The speed of the moving train equals 1000 m divided by 120 s, yielding 25/3 m/s. Using the crossing formula distance equals speed multiplied by time, the distance covered in 4 minutes (240 seconds) is 25/3 multiplied by 240, yielding 2000 m. The total distance is the sum of the moving train length and the stationary train length, so the stationary train length is 2000 m minus 1250 m, which is 750 m.

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