Let the speed of the slower train be x m/sec.

Then, speed of the faster train = 2x m/sec.

Relative speed = (x + 2x) m/sec = 3x m/sec.

	(100 + 100)	= 3x
	8

 24x = 200

x =	25	.
	3

=		50	x	18	km/hr
		3		5

   = 60 km/hr.