Question 1040149
w, wind speed
r, airplane speed without wind
r=250


WHAT amounts of time for those 350 miles and 390 miles?
t time for the tail wind travel
x time for the headwind travel


{{{system((r+w)t=350,(r-w)x=390)}}}


{{{system((250+w)t=350,(250-w)x=390)}}}------Not much more can be done.  Three unknown variables but only two equations.