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4. 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. \( 8x + 7(325) = 15(350) \)
Answer: E