Question

a train 600 m long travelling at a speed of 60 km/h,passes a bridge in 90 sec . what is the length of the bridge

Answer 1

speed = 60km/h = 50/3m/s
length of bridge = 50/3 * 90 +600
= 150+600
750m
please comment if you have any doubt

Answer 2

In this.. Firstly convert the speed of train into m/s...
And the speed will be...
$60 \times 1000 \div 60 \times 60$
The speed will be 100/6
Now.. Find the distance in 90 sec...
Formula....
$d = s \times t$
Distance will be... 1500...
Now the time starts when the train was start entering in the bridge... So we subtract the length of train...
The actuall length of bridge will be... 900