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

Problem 3. 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 [NEET 1991] 

(a) 9 km/h

(b) 16 km/h

(c) 18 km/h

(d) 48 km/h



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