Question

A train, 130 metres long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. The length of the bridge is

Answer 1

Answer:

275m

Explanation:

s=vt

130+x(total distance)=45×5/18(v in m/s)×30 (in second)

x=375-130

x=245

Answer 2

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

d = (L + 130) m

The speed of the train is,

v = 45 km/h = 45 × 5 / 18 = 12.5 m/s

Then,

12.5 × 30 = L + 130

375 = L + 130

L = 245 m