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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



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


Grade:10

1 Answers

Amit Saxena
35 Points
7 years ago

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

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