Multiple choice

A train crosses a 110 m. long platform in 13.5 seconds and 205 m. long platform in 18.25 seconds. What was the speed of the train?

  1. 69 km/hr.

  2. 72 km/hr.

  3. 66 km/hr.

  4. 75 km/hr.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let train length be L meters and speed be S m/s. For first platform: L+110 = S×13.5. For second platform: L+205 = S×18.25. Subtracting: (L+205) - (L+110) = S×(18.25-13.5) → 95 = 4.75S → S = 20 m/s = 72 km/hr. The train length is L = 20×13.5 - 110 = 160 m, but the question only asks for speed.