Tammy drove 315 miles in 5 hours.

At the same rate, how many miles would she drive in 8 hours?

504 miles

Step-by-step explanation:

You need to find the unit rate. to do that, divide the miles by the hours. you should find the unit rate to be 63 miles / 1 hour. multiply that by 8 (because it's 8 hours) and you'll get 504 miles / 8 hours