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A car makes a trip due north for three-fourths of the time and due south one-fourth...

A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 30 m/s, and the average southward velocity has a magnitude of 34 m/s. Taking northward to be the positive direction, what is the average velocity for the trip?

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