Question: After driving due north at (72 mathrm{~km} / mathrm{hr}) for 2 hours, you stop for (20 mathrm{~min}) and then head back south at (108 mathrm{~km}

After driving due north at \(72 \mathrm{~km} / \mathrm{hr}\) for 2 hours, you stop for \(20 \mathrm{~min}\) and then head back south at \(108 \mathrm{~km} / \mathrm{hr}\) to reach your starting position. What is your

\((a)\) average velocity

\((b)\) average speed at the end of the trip?

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