SOLUTION: At a 3-mile cross-country race an athlete runs 2 miles at 8 mph and 1 mile at 10 mph. What is the athlete's average speed?

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Question 215637This question is from textbook
: At a 3-mile cross-country race an athlete runs 2 miles at 8 mph and 1 mile at 10 mph. What is the athlete's average speed? This question is from textbook

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
2/8+1/10
(2*10+1*8)/8*10)
(20+8)/80
28/80=.35 hours for the race.
3/.35=8.57 mph. was the average speed.