Three cities lie along a perfectly linear route: springfield, clarksville, and allentown. molly lives in springfield and works in allentown. she makes it to work using two gallons of gas in her car. her friend edgar lives in allentown and works in clarksville. it takes edgar one gallon of gas to get to work. if molly's car averages 26 miles per gallon, and edgar's car averages 17 miles per gallon, about how far apart are springfield and clarksville?

When it says that the cities are routed linearly, it means that these cities are located right next to each other. From the left, the order is Springfield, Clarksville, then Allentown. You have details on the number of gallons and the mileage. To get the distance travelled, just multiply the mileage with the gallons, to cancel out gallons leaving you with the distance in miles.

Now, since Molly travelled from Springfield to Allentown, the total distance she covered is the distance Edward travelled and the unknown distance between Springfield and Clarksville, denoted as x in the picture. So, the equation is then

Molly's distance = x + Edgar's distance
26 miles/gal(2 gal) = x + 17 miles/gal(1 gal)
x = 35 miles

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