SOLUTION: During rush hour, Fernando can drive 40 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando's rate on the side roads is 7 mi/h

Question 89099: During rush hour, Fernando can drive 40 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando's rate on the side roads is 7 mi/h faster than his rate on the freeway, find his rate on the side roads.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
s = rate on sides roads
f = rate on freeway
is his rate on side roads. We don't actually know what t is, but
is his rate on the freeways and it's the same t, so the ratio
is the ratio os his rate on side roads to
his rate on freeways

multiply both siides by

Also given is

Is the ratio true?
Yes
So, his rate on the side roads is 28 mph
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