Bunuel wrote:
Jerry travels 8 miles at an average speed of 40 miles per hour, stops for 10 minutes, and then travels another 20 miles at an average speed of 60 miles per hour. What is Jerrys average speed, in miles per hour, for this trip?
A. 40
B. 42.5
C. 44
D. 50
E. 52.5
Kudos for a correct solution.
A. 40
B. 42.5
C. 44
D. 50
E. 52.5
Kudos for a correct solution.
Average Speed = Total Distance / Total Time
Total Distance = 28
Total Time = 8/40 + 1/6 + 20/60
= 21/30
Average Speed = 28 * 30 / 21
= 40 miles/ hr
A