A moving train, 66 metres long, overtakes another train

A moving train, 66 metres long, overtakes another train of 88 metres long, moving in the same direction in 0.168 minutes. If the second train is moving at 30 km/hr, at what speed is the first train moving ?

Suppose the speed of first train be x kmph
Speed of second train = 30 kmph

=	3 × 1000	= 500 m per min.
	60

∴ According to question

Total Distance

Relative speed

=	(66 + 88)	= 0.168
	x − 500

⇒	154	= 0.168
	x − 500

⇒ 0.168x – 84 = 154
⇒ 0.168x = 238

⇒ x =	238
	0.168

=		238 × 1000		m per minute
		168

=	238 × 1000	×	3	kmph
	168		50

= 85 kmph