Question

a train 100m long crosses a bridge at the speed of 72km/hr in 25 seconds find the length of the bridge​

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

\begin{gathered}20=\frac{100+x}{25}\\\\100+x=500\\x=400\end{gathered}

20=

25

100+x

100+x=500

x=400

Therefore, the length of the bridge is 400 m

Hope it helps ヾ(＾-＾)ノ

Answer 2

Answer:

400 meters

Step-by-step explanation:

HOPE IT WILL HELP YOU.