A 100 m long train is running at a speed of 30 km/h. Find the time taken by it to pass a man standing near the railway line.

12 seconds

The correct answer is Option (3) → 12 seconds

Distance travelled by train to pass a man standing near the railway line = The length of train, D = 100 m = 0.1 km

The speed of train, S = 30 km/hr

Time taken = \(\frac{D}{S}\) = \(\frac{0.1}{30}\) = 0.2 min = 12 seconds