A car travels along a straight stretch of road.

Question

It proceeds for 15.9 mi at 51 mi/h, then
25.3 mi at 41 mi/h, and finally 34.3 mi at
38.6 mi/h.
What is the car’s average velocity during
the entire trip?
Answer in units of mi/h

Answer 1

total distance: 15.9+25.3+34.3 = 75.5 mi
total time: 15.9/51 + 25.3/41 + 34.3/38.6 = 1.82 hr

So, avg speed is 75.5mi/1.82hr = 41.55 mi/hr

Answer 2

41.55