Question

a train 100 m long passes a bridge at rate of 72km/h in 25 seconds .the length of bridge is

Answer 1

Answer:

The length of the bridge is 400 m

Step-by-step explanation:

Let the length of the bridge is x m.

Speed of the train is 72 km/h = 72×5/18 = 20 m/s

Time taken to cross the bridge = 25 s

Distance traveled by the train = Length of the train + length of the bridge

d = 100 +x

Now, using the relation of speed, distance and time

Speed = Distance/time

$20=\frac{100+x}{25}\\\\100+x=500\\x=400$

Therefore, the length of the bridge is 400 m

Answer 2

Answer:

a train 100 m long passes a bridge at rate of 72km/h in 25 seconds .the length of bridge is