Multiple choice

A train running at uniform speed crosses 600 m and 300 m long two bridges in 2 minutes and 80 seconds respectively. What is the speed of the train?

  1. 27 km/hr

  2. 42 km/hr

  3. 36 km/hr

  4. 48 km/hr

  5. 84 km/hr

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

Let train length = L meters and speed = S m/s. For first bridge: (L+600)/S = 120 seconds (2 min). For second bridge: (L+300)/S = 80 seconds. Solving: L+600 = 120S and L+300 = 80S. Subtracting: 300 = 40S, so S = 7.5 m/s = 27 km/hr. This matches option A.