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)

Question

Mathematics

Blackie

7 March, 11:05

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)

+3

Answers (1)

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Keyon Blevins · Answer 1

E. 8x+7 (325) = 15 (325)

It would include the 8 hrs. of x miles per hour and the 7 hrs. of 325 miles per hour, giving the total miles. Then, as you eliminate, you can find out what (x) is.