Question

A 120 m long train running at 54 km/hr. crosses a
bridge in 20 sec. Find length of bridge.

Answer 1

Answer:

The length of the bridge is 180 m.

Step-by-step explanation:

Here the length of the train is 120,the speed of the train is 54km/hr and crosses a bridge in 20sec.

we know, 1 km/hr=(5/18)m/s

speed=54×(5/18)m/s

         ⇒15 m/s

Let x be the length of the bridge.

so the total distance is (120+x)m.

We know Time=Distance/speed.

              ⇒20=(120+x)/15

             ⇒x=180

So the length of the bridge is 180 m.