Solve the following problem given below:
Problem: A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 40.0 min at 90.0 km/h, 19.0 min at 80.0 km/h, and 40.0 min at 50.0 km/h and spends 25.0 min eating lunch and buying gas.
Part A: Determine the average speed for the trip.
km/h
Part B: Determine the distance between the initial and final cities along the route.
km
I need expert help to solve the above question.