Posted by Brandon on Friday, November 30, 2007 at 3:22pm.
Please review.
Ella can drive 65 mi on side roads in the same time that it takes to drive 30 mi on the interstate. Ella's rate on the side roads is 7 mi faster than her rate on the interstate, what is her rate on the side roads?
65/x+7=30/x
35x=210
x=6
6+7=13

Math  Michael, Friday, November 30, 2007 at 5:04pm
Use the equation distance = rate multiplied by time (d = r*t).
Let s be her rate on the side roads.
d = r*t
65 = s*t
Now, form a similar equation (using the numbers 30 & 7).
After you come up with your two equations, use either substitution or elimination to solve it.
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