SOLUTION: At what speed must a biker return from Town B to Town A, a distance of 30 miles, if the trip there took 2 hours and 30 minutes, and he wishes to average 15 miles per hour for the e

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: At what speed must a biker return from Town B to Town A, a distance of 30 miles, if the trip there took 2 hours and 30 minutes, and he wishes to average 15 miles per hour for the e      Log On

 

Hi,

Note:  D = r*t  OR r = D/t

 r = 30mi/2.5hr = 12mph , the rate to 

  Let x represent rate back...

wishing to average 15mph for the entire trip

    (12mph + x)/2) = 15mph

              x = 18mph