Question

The length of the bridge, which a train 130 meters long and travelling at 45 km/hr can cross in 30 seconds is :

• A. 200
• B. 225
• C. 245
• D. 250

Answer 1

Answer:

C. 245

The train's speed is given in km/hr, but the train length and time are in meters and seconds. We convert the speed by multiplying the speed with 5/18 Speed =45 x 5/18 = 25/2 m/s Let the length of bridge be X metres. distance/ time = speed [X + 130]/30 = 25/2 X + 130 = 25/2 x 30 X + 130 = 375 X = 375 - 130 = 245