Problem: A motorist on a road trip drives a car at different constant speeds over several legs of the trip. He drives for 45.0 min at 50.0 km/h, 7.0 min at 95.0 km/h, and 30.0 min at 35.0 km/h and spends 60.0 min eating lunch and buying gas.
(a) What is the total distance traveled over the entire trip (in km)?
(b) What is the average speed for the entire trip (in km/h)?