Question 912737
r, rate of plane in still air
w, speed of wind when going against it
2w, speed of wind when going WITH it


Use the time values as HOURS.  Here is a data table with as much information as possible put:


_________________rate___________time_____________distance
AGAINST__________r-w____________{{{4&2/3}}}____________2100
WITH_____________r+2w___________4________________2100


The uniform rates travel rule is RT=D rate time distance.  Use the rule to make the two needed equations and solve for r and w.