A train passes a platform 110 m long in 40 seconds and a

A train passes a platform 110 m long in 40 seconds and a boy standing on the platform in 30 seconds . The length of the train is

Let the length of the train be x metres.

Speed of train in crossing boy =	x
	30

Speed of train in crossing platform =	x + 110
	40

According to the question,

x + 110	=	x
40	=	30

⇒	x + 110	=	x
	4		3

⇒ 4x = 3x + 330
⇒ x = 330 metres