<p>Shelby went from her house to the mall at 7mph and came back the same way at 12mph. If the entire round trip took an hour, how far was the distance between the house and the mall?
How do you do this?</p>
<p>Let x be the distance to the mall. Then
x/7 is the time it took to get to the mall, and x/12 is the time it took to get back.
x/7 + x/12 = 1.
12x + 7x = 84
19x = 84
x = 4.42 miles.</p>
<p>[imgur:</a> the simple image sharer](<a href=“http://imgur.com/LuNhA]imgur:”>Imgur: The magic of the Internet)</p>
<p>Hope that helps / this is still relevant.</p>
<p>7*12
------ = 84/19
7 + 12</p>
<p>You are done.</p>