HINT:#
The question asks us to determine the average velocity of the blob over the three year period investigated in the previous question.
HINT:#
The previous problem resulted in the distance traveled by the blob during a finite time interval.
HINT:#
v = L/t

NOTE: Here, L is equal to the length of the blob's travel.
HINT:#
L = 25 ly
t = 3 yr
HINT:#
Let's use unit analysis:
v(ly/yr) = L(ly)/t(yr)
No conversions necessary!
HINT:#
v = L/t
= 25.03 ly/3 yr
= 8.3 ly/yr

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