Ashley drove 648 miles in 9 hours. At the same rate, how many miles would she drive in 7 hours?

First, divide 648 by 9. 648/9=72. Now we know that Ashley covers 72 miles in an hour. In order to get the number of miles she covers in 7 hours we must multiply 72 by 7 which equals 504. So Ashley would drive 504 miles in 7 hours.