Question

N. A bus travelling the first one third distance at a speed on 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) 9km/h (b) 16 km/h (c) 18 kmh (d) 48 km/h​

Answer 1

Answer:

c)18 kmph

Explanation:

let distance =d for every interval

from formula

avg speed=tota dist/total time

                 = d+d+d/(d/10+d/20+d/60)                    (from time=distance /speed)

                  =3d/10d/60

                    =18kmph

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