Ryan drove 320 miles in 5 hours to complete the first part of his trip. It took him 12 hours to drive 768 miles. Select all the proportional relationships that are true.
a) 320 mi/5 hr = 168 mi/5hr
b) 168 mi/320 mi = 5hr/12hr
c) 64 miles per 1 hour
___________
d) miles|__5__|_12__|
hours|_320_|_768|