Question

A train 50 m long passes over a bridge with velocity of 30 km/h . If it takes 36 s to cross the bridge the length of the bridge will be?

Answer 1

let the length of bridge be x m
length of train = 50m
distance covered by train = (50+x) m
speed = 30km/h => 30×5/18 => 25/3 m/s
time taken = 36 s

we know that ,
speed=distance/time
distance = Speed × time
50+x = 25/3×36
x = 300-50 => 250m
hope this helps

Answer 2

Distance = Speed × Time
L + 50 = (30 * 5/18) × 36
L + 50 = 300
L = 250 m

Length of the bridge (L) is 250 m
[Note: I converted velocity from km/h to m/s by multiplying 5/18 to it.]