Two trains 150 m and 120 m long respectively moving from

Two trains 150 m and 120 m long respectively moving from opposite directions cross each other in 10 secs. If the speed of the second train is 43.2 km/hr, then the speed of the first train is

Speed of second train
= 43.2 kmph

=	43.2 × 5	m/sec.
	18

or 12 m/sec.Let the speed of first train be x m per second, then

150 + 120	= 10
x + 12

⇒ 27 = + x 12
⇒ x = 15 m/s

= 15 ×	18	kmph = 54 kmph
	5