Question

A man sees a train passing over a bridge 1 km long. The length of the train is half that of the bridge. If the train clears the bridge in 2 minutes, the speed of the train is

• A. 30 km/hr
• B. 45 km/hr
• C. 50 km/hr
• D. 60 km/hr

Answer 1

The correct option is B 45 km/hr

$\text{Length of bridge}=1000m.\text{Length of train}=500m.\text{Total distance covered in clearing the bridge}=1500m.\text{Time taken}=120\text{seconds.}\therefore \text{Speed}=\left(\frac{1500}{120}\right)m/sec=(\frac{25}{2}\times \frac{18}{5})kmph=45kmph.$