Question

A bus travels the first one-third distance at a speed of
10 km h, the next one-third distance at a speed of
20 km h- and the next one-third distance at a speed
of 30 km h-1. The average speed of the bus is​

Answer 1

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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 2

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