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question mark

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

Hrishant Goswami , 12 Years ago
Grade 10
anser 1 Answers
Amit Saxena

(c)
    Average speed =   s/((s/3)/10+(s/3)/20+(s/3)/60)
        =   s/(s/18)=  18 km/h

Last Activity: 12 Years ago
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