A woman drives a car from one city to another with different constant speeds along the trip. She drives at a speed of 65.0 km/h for 15.0 min, 70.0 km/h for 25.0 min, makes a stop for 40.0 min, then continues at 45.0 km/h for 30.0 min, at which point she reaches her destination.
(a) What is the total distance between her starting point and destination (in km)?
(b) What is the average speed for the entire trip (in units of km/h)?