Correct answers only please! If you don't know the answer, then please don't guess or say what you think it is.

Mike recently increased the size of his truck tires from the original P215/60R16 to the larger P235/7016. If Mike didn't recalibrate his speedometer, how fast is really going on the new tires when his speedometer shows he is traveling 60 mph?

A. 54.2 mph

B. 63.8 mph

C. 66.4 mph

D. 69.7 mph