An airplane flew for 8 hours at an airspeed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the following equations could be used to find x?
A. x + 325 = 2 (350)
B. x + 7 (325) = 15 (350)
C. 8x - 7 (325) = 350
D. 8x + 7 (325) = 2 (350)
E. 8x + 7 (325) = 15 (350)
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