The closest distance between Earth and Mars is approximately 3.39 x 107 miles. The fastest rocket leaving Earth travels at an average speed of approximately 3.6 x 109 miles per hour. At what rate, which expression could be used to determine the approximate number of hours it would take the rocket to travel that distance? A. (3.39 x 10^7) - (3.6 x 10^4)

B. (3.6 x 10^4) - (3.39 x 10^7)

C. (3.39 x 10^7) - (3.6 x 10^4)

D. (3.6 x 10^4) - (3.39 x 10^7)

(If anyone knows the answer please explain why it is the answer)