SOLUTION: Sam drove for 2 hours at 45 mph. He has the same distance remaining. How fast should he drive to make his average speed 60 mph?

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Question 1019099: Sam drove for 2 hours at 45 mph. He has the same distance remaining. How fast should he drive to make his average speed 60 mph?
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
2 hrs @ 45 mph=90 miles
90/45+90/x=180/60
2+90/x=3
90/x=1
x=90 miles an hour speed needed to average 60 miles per hour for the whole trip!!!!!!