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December 19, 2014

December 19, 2014

Posted by **Brandon** on Friday, November 30, 2007 at 3:22pm.

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 5:04pmUse 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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