Ed is on a road trip. He has already traveled 229 miles and is driving at a rate of 68 miles per hour. Which equation could be used to find how many hours, x, Ed has left in his road trip if he is traveling 647 total miles?
A.
68x + 647 = 229

B.
229x + 647 = 68

C.
68x + 229 = 647

D.
229x + 68 = 647