Question

80. At the speed of 60 km per hour, 125
meter long train crosses a bridge in 30
seconds. What is the length of bridge ?​

Answer 1

Length of the bridge is 375m.

1. Speed of the train is 60 km/hr.
2. We convert the given speed in m/s as 60 * 5 / 18 = 50 / 3 m/s.
3. Time taken to cross the bridge is 30 seconds.
4. Total distance covered by the train to cross the bridge is 50 /3 (speed) * 30 (time) = 500 meters.
5. To cross the bridge , the train covers a distance = length of train + length of the bridge

500 = 125 + length of bridge

Length of bridge = 375 meter