SOLUTION: A car is making a 12 mile trip. It travels the first 6 miles at 30 miles per hour and the last 6 miles at 60 miles per hour. What is the car's average speed for the entire trip?

Question 348479: A car is making a 12 mile trip. It travels the first 6 miles at 30 miles per hour and the last 6 miles at 60 miles per hour. What is the car's average speed for the entire trip?
Answer by tuasoo(1) (Show Source): You can put this solution on YOUR website!
Time taken to travel first 6 miles = 6/30 hr = 0.2 hr
Time taken to travel last 6 miles = 6/60 hr = 0.1 hr
Total time taken to travel the 12 miles trip = 0.3 hr
Therefore, the car's average speed for the entire trip = 12/0.3 mph = 40 mph.
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