Question

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
(c) 18 km/h
Tot. d.
(b) 16 km/h
(d) 48 km/h​

Answer 1

Explanation:

Let total distance be x

It covered

x/3 at 10

x/3 at 20

x/3 at 60

Times taken respectively are { d / t }

x / 30

x / 60

x / 180 respectively

total time = x/30 + x /60 + x/180

= 10x / 180

= x / 18

Average speed of bus (avg s )

= total distance / total time

avg s = x / {x/18}

avg s = 18 km / h

ANSWER = 18 km/hr

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