Question 1103271
Into the wind, {{{r-w=3000/6=500}}}


Withe the wind, {{{r+w=3000/5=600}}}


Question seems to be asking for time when w=0, d=3000.


First find r.
{{{system(r-w=500,r+w=600)}}}
{{{2r=1100}}}
{{{highlight_green(r=550)}}}---------plane without wind


{{{550*t=3000}}}---------solve for t.