Buses start from a bus terminal with a speed of 20 km/hr

Buses start from a bus terminal with a speed of 20 km/hr at intervals of 10 minutes. What is the speed of a man coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 8 minutes?

Distance covered in 10 minutes at 20kmph = distance covered in 8 minutes at (20 + x )
kmph

⇒ 20 ×	10	=	8	(20 + x )
	60		60

⇒ 200 = 160 + 8x
⇒ 8x = 40

⇒ x =	40	= 5 kmph
	8