SOLUTION: A man drove 220 miles in 3 1/2 hours. Part of the trip was at 60 miles per hour and the rest at 65 miles per hour. find the time spent at lower speed.
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Question 92870: A man drove 220 miles in 3 1/2 hours. Part of the trip was at 60 miles per hour and the rest at 65 miles per hour. find the time spent at lower speed. Answer by checkley75(3666) (Show Source):
You can put this solution on YOUR website! 220=60T+65(3.5-T)
220=60T+227.5-65T
220-227.5=-5T
-5T=-7.5
T=-7.5/-5
T=1.5 HOURS AT THE SLOWER RATE OF 60MPH.
PROOF
220=60*1.5+65*2
220=90+130
220=220
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