【求助】几道GWD数学题

cathysl

    

Q14: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 250 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?

    

 

    

A.    280

    

B.     290

    

C.     300

    

D.    310

    

E.     320

    

Answer:    b

    

cathysl

Q29:
    

A sum of money was divided between John and
Anne such that the ratio of John’s share to Anne’s share was 5 to 3.  If John’s share exceeded  of the sum of money by
$50, what was Anne’s share?

    

 

    

A.    $180

    

B.     $270

    

C.     $340

    

D.    $450

    

E.     $720

    Answer: b