SOLUTION: If you drove for 30 minutes at 60 mph and 10 minutes at 38 mph. What was your average speed for the trip?

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Question 711756: If you drove for 30 minutes at 60 mph and 10 minutes at 38 mph. What was your average speed for the trip?
Found 2 solutions by checkley79, Edwin McCravy:
Answer by checkley79(3341) (Show Source):
You can put this solution on YOUR website!
D=RT
D=60*.5
D=38*.167
D=60*5+38*.167
D=30+6.346
D=36.346 MILES.
36.346=R(.5+.167)
36.346=.667R
R=36.346/.667
R=54.34 MPH. IS THE AVERAGE SPEED.

Answer by Edwin McCravy(20056) (Show Source):
You can put this solution on YOUR website!

The other tutor used decimals and rounded off, making his answer off a little. I'll use fractions. We use two formulas: Distance = Rate � Time Average Rate = Total Distance � Total Time When you went 30 minutes (half an hour) at 60 mph, you went 60� = 30 miles When you went 10 minutes ( of an hour) at 38 mph, you went 38� = = = miles To find the total distance, we use the improper fraction for the distance at 38 mph Total distance = or miles. Total time = or hr. Average Rate = Total Distance � Total Time We will use the improper fraction for the total miles Average Rate = �mph. Edwin