SOLUTION: Michael drove his car to the foothills @ 70mph. Once he arrived @the foothills he biked 30mph. His total trip took 4 hours, and his total distance was 140 miles. How long did he dr
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-> SOLUTION: Michael drove his car to the foothills @ 70mph. Once he arrived @the foothills he biked 30mph. His total trip took 4 hours, and his total distance was 140 miles. How long did he dr
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Question 1002420: Michael drove his car to the foothills @ 70mph. Once he arrived @the foothills he biked 30mph. His total trip took 4 hours, and his total distance was 140 miles. How long did he drive his car? Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website! Call the time he drove his car, t.
Then the time he rode the bike would be 4-t.
Thus we can write
70t + 30(4-t) = 140
70t + 120 - 30t = 140
40t = 20
t = .5 hours
