A taxi driver leaves the airport to drop a passenger at his hotel, making the following trips: she drives \(7.2 \mathrm{~km}\) in \(10 \mathrm{~min}\), stops and waits for the passenger at a convenience store for \(7 \mathrm{~min}\), drives another \(5 \mathrm{~km}\) to the hotel in \(10 \mathrm{~min}\), where she waits \(3 \mathrm{~min}\) for the passenger to get off. She then returns to the airport via a different route that is \(10 \mathrm{~km}\) long in \(6 \mathrm{~min}\).

(a) What is her average speed for the whole trip? \((b)\) What is her average velocity? \(\cdot\)