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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
(a) 9 km/h
(b) 16 km/h
(c) 18 km/h
(d) 48 km/h
(c) Average speed = s/((s/3)/10+(s/3)/20+(s/3)/60) = s/(s/18)= 18 km/h
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