A person travels by car from one city to another with different constant speeds between the pairs of cities. She drives for 30.. min at 80.0 km/h, 12.0 min at 100 km/h, and 45.0 min at 40.0 km/h, and spends 15.0 min eating lunch and buying gas.

What is the average speed for the trip?
What is the distance between the initial and final cities along this route?

Hint: compute distances and time for each leg. Can you do that?