The average velocity of the journey is 24.65miles/s
Average velocity is the ratio of the total displacement to the total time taken for a journey. It is measured In m/s and it is a vector.
Therefore average velocity = Total displacement / total time taken
from velocity = distance/time
The time taken for the first journey(t1) = distance/velocity
t(1) = 15/20 = 0.75s
the time taken for the second journey (t2)= 20/30= 0.67s
The total time taken = 0.67s+ 0.75s = 1.42s
Therefore, average velocity = (15+20)/1.42
= 35/1.42 = 24.65miles/s
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