Question

A train 250 m long passes a pole in 10 seconds and a bridge in 25 seconds. Find the length of the bridge.
Ajay's driving speed for a 6 hour trip was 65 km/h Du​

Answer 1

Time = 10 seconds

Distance = 250m (since it crosses the pole)

Speed = Distance/time

Speed = 250/10

speed = 25m/s

Now in case of bridge

t = 25 seconds,

Speed = 25m/s

Distance = length of train + length of bridge

Also, distance travelled = Speed x time

=> 25 x 25 = 625metre

But we know that distance = length of train + length of bridge (since the train crosses the bridge, its own length will also be added to get distance)

=> 250 + length of bridge = 625

=> length of bridge = 625 - 250 = 375 m

Length of bridge is 375m