Question

200m long train crosses a long bridge with a speed of 36km/he .calculate the time taken by train to cross the bridge

Answer 1

distance = 200m
speed = 36 ×1000/3600 m/s
= 10m/s



time = 200/10 s
= 20 seconds

Answer 2

Let length of bridge be L. Total distance required for the train to cross the bridge is,

d = (L + 200) m

The speed of the train is,

v = 36 km/h = 36 × 5 / 18 = 10 m/s

Then time taken to cross the bridge is,

t = [(L + 200) / 10] s