SOLUTION: If A car travels at 20 mph for 2 miles and 40 mph for 8 miles, what is the average rate of speed?

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Question 840836: If A car travels at 20 mph for 2 miles and 40 mph for 8 miles, what is the average rate of speed?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If A car travels at 20 mph for 2 miles and 40 mph for 8 miles,
what is the average rate of speed?
:
Write a time equation; time = dist/speed
let a = the average speed
2%2F20 + 8%2F40 = 10%2Fa
multiply by 40a, cancel the denominators, and find a