A train 200 m long running at 36 kmph takes 55 seconds to

A train 200 m long running at 36 kmph takes 55 seconds to cross a bridge. The length of the bridge is

Speed of train = 36kmph

= 36 ×	5	= 10 m/sec.
	18

If the length of bridge be x metre, then

10 =	200 + x
	55

⇒ 200 + x = 550
⇒ x = 550 – 200 = 350 metre.

Second Method :
Here, x = 200 m

u = 36 km/hr,	36 × 5	m/second = 10 m/sec
	18

y = ?, t = 55 sec
using

t =	x + y
	u

55 =	200 + y
	10

y = 550 – 200
y = 350 m