A certain pilot flew 400 miles to City K at an average speed of 350 miles per hour with the wind and made the trip back at an average speed of 200 miles per hour against the wind. Which of the following is closest to the pilot’s average speed, in miles per hour, for the round-trip?  Select: A) 280 B) 290 C) 250 D) 310 E) 320
Avg speed = total distance/ total time   total distance = 800   total time = 400/350 + 400/200 = 22/7   =&gt; avg speed = (800*7)/22 = 250(approx)   ans is 250
<result>C</result>
A certain pilot flew 400 miles to City K at an average speed of 350 miles per hour with the wind and made the trip back at an average speed of 200 miles per hour against the wind. Which of the following is closest to the pilot’s average speed, in miles per hour, for the round-trip?