Math
posted by Brandon on .
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

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.