SOLUTION: It took Eric 11 hours to drive to a family reunion. On the way home, he was able to increase his average speed by 18mph and make the return drive in only 8 hpurs. Find his average

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Question 1109003: It took Eric 11 hours to drive to a family reunion. On the way home, he was able to increase his average speed by 18mph and make the return drive in only 8 hpurs. Find his average speed on the return drive.
Answer by ikleyn(52887)   (Show Source): You can put this solution on YOUR website!
.
The "distance" equation


    11*(r-18) = 8*r,      (saying that the distance in both ways is the same)


where "r" is the average speed on the return drive (which is under the question).


11r - 11*18 = 8r  ====>  11r - 8r = 11*18  ====>  3r = 11*18  ====>  r =  = 66.


Answer.  The average speed on the return trip was 66 miles per hour.

Solved.

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To see other similar introductory Travel and Distance problems, see the lessons
    - Travel and Distance problems
    - Travel and Distance problems for two bodies moving in opposite directions
    - Travel and Distance problems for two bodies moving in the same direction (catching up)
in this site.


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