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?
Algebra.Com
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) (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.
RELATED QUESTIONS
an athlete runs at 9mph and then at 12 mph, covering 10 miles in 1 hour. how long did the (answered by checkley71)
An athlete runs at 9 mph and then at 12 mph, covering 10 miles in 1hour. How long does... (answered by jorel1380)
An athlete runs 8 miles, first at a slower speed and then at a faster speed. The total... (answered by Cromlix)
an athlete runs at 9 mph and then at 12 mph, covering 10 miles in one hour. how long does (answered by Fombitz)
an athlete can run 9 km in 1 hour. of the athlete runs at that same average speed for 2... (answered by checkley77)
At first an athlete jogs at 5 miles per hour and then jogs at 8 miles per hour, traveling (answered by ankor@dixie-net.com)
this is a question in my 8th grade Pre algebra class that i don't understand: If an... (answered by richwmiller)
1. A tennis ball travels at 40 m/s. How far will it travel in 1 and a half seconds?
2.... (answered by Alan3354)
An athlete can run 9 kilometers in 1 hour. If the athlete runs at that same average speed (answered by CharlesG2)