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:

Let the length be x m.

Then, (x + 100) = 72 × 25 ×

5

18

= 500

∴ x = 500 - 100 = 400 m

Answer 2

Answer:

Length of bridge=400m

Step-by-step explanation:

Given

Length of train = 100m

Speed = 72 km/hr

In m/s = 72 x 5/18

= 20 m/s

Time = 25s

Length of bridge=?

We now

Time x speed = total distance

So,

25s x 20m/s = length of train +length of bridge

500 = 100m + length of bridge

Length of bridge = 500m - 100m

Length of bridge=400m