Melissa drove 871 miles in 13 hours.
At the same rate, how long would it take her to drive 603 miles?
To find out how long it would take Melissa to drive 603 miles at the same rate, we can set up a proportion:
871 miles / 13 hours = 603 miles / x hours
Cross multiplying, we get:
871 * x = 603 * 13
Simplifying the equation, we have:
871x = 7839
To isolate x, we divide both sides of the equation by 871:
x = 7839 / 871 = 9
Therefore, it would take Melissa 9 hours to drive 603 miles at the same rate.