A man covers a total distance of 100 km on bicycle. For

A man covers a total distance of 100 km on bicycle. For the first 2 hours, the speed was 20 km/hr and for the rest of the journey, it came down to 10 km/hr. The average speed will be

Distance covered in first 2 hours
= 2 × 20 = 40 km.
Remaining distance
= 100 – 40 = 60 km.
Time taken in covering 60 km at 10 kmph

=	60	= 6 hours
	10

∴ Required average speed =	Total distance
	Total Time

=		100		kmph
		2 + 6

=		100		kmph
		8

=	25	kmph
	2

= 12	1	kmph
	2

12	1	km/hr
	2

15	1	km/hr
	8