A bus travelling the first one third distance at a speed

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A bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/h and the last one-third at 60 km/h. The average speed of the bus is

1. 9 km/h
2. 16 km/h
3. 18 km/h
4. 48 km/h

Correct Option: C

Average speed

Average speed =	s
	(s/3)/10 + (s/3)/20 + (s/3)/60

=	s	= 18 km/h
	s/18