If a person travelled one-third of
the distance with a velocity of 20.0
km/h, next one-third with a velocity
of 30.0 km/h and 60.0 km/h in the
last portion of the journey. Find the
average velocity of total journey.
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Let the total distance travelled be x km Then total time taken
= 10x/3+ 20x/3+ 60x/3
= 30x + 60x + 180
x
=
180
6x+3x+x
=
180
10x
=
18
x
hrs Then average speed = =
Totaltimetaken
Totaldistancetravelled
=
x/18
x
km/hr = 18 km/hr
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