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Solution

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Correct option is C)

Given,

Velocity for one third of distance $V_{1}=20km/h$

Velocity for two third of distance $V_{2}=60km/h$

Time take to cover one third of distance $t_{1}=V_{1}d/3 =20d/3 $

Time taken to cover two third of distance $t_{2}=V_{2}2d/3 =602d/3 $

$Average velocity =totaltimeTotaldistance $

$V_{av}=t_{1}+t_{2}d =20d/3 +602d/3 d =36km/h$

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