Question

A train 150 metre long is running at 72 km/hr. it crosses in 13 seconds. find the length of the bridge .
​

Answer 1

Answer:

110 metres

Step-by-step explanation:

Let the length of the bridge be x

Length of train = 150 m

Total distance traveled by train = 150+x

Time = 13 seconds

Speed = 72 km/hr = 20 m/s

Now

20=150+x / 13

260=150 + x

x=260-150

x=110

Hence the length of the bridge is 110 m.

Answer 2

Answer:

Given:

length of the train = 150 metre

speed = 72km/hr = 20 m/s

time taken to cross the bridge=13 sec

To Find :

length of the bridge = ?

_______________________________

let the length of the bridge be x

length of train = 150 m

total length = 150+x

Formula :

$distance = speed \times time$

Calculation:

distance= speed * time

$150 + x = 12 \times 3 \\ 150 + x = 260 \\ x = 260 - 150 \\ x = 110m$

Thus , the length of the bridge is 110 m