A balloon drifts 140 m toward the west in 45 s; then the wind suddenly changes and the balloon flies

A balloon drifts 140 m toward the west in 45 s; then the wind suddenly changes and the balloon flies 90 m toward the east in the next 25 s.

j. What was its average velocity during the first 45 s?
k. What was its average velocity during the next 25 s?
l. What was its average velocity for the entire trip?

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