A train travels from city A to city B and then to city C. The distance from A to B is 220 miles and the distance from B to C is 87.5 miles. The average speed from A to B was 55 miles per hour, and the average speed from B to C was 35 mph. What was the average speed from A to C (that is for the entire trip) in miles per hour?
find the time taken to go from A to B
(220/55) hrs
find the time from B to C
add up the times
divide (total distance/total time)
editorial: This is College Calculus???