Question 1103373
r*t=d
with the wind
(r+c)*5=2575
r+c=2575/5
r+c=515
against the wind
r-c=2250/5
r-c=450
we have
r-c=450
r+c=515
add
2r=965
r=965/2
r=482.5 mph plane

482.5*5+c*5=2575
2412.5+c*5=2575
c*5=162.5
c=162.5/5
c=32.5 mph wind
check with
(482.5+c)*t=2575
(482.5+32.5)*5=2575
(515.0)*5=2575
2575.0=2575
ok
check against
(482.5-c)*t=2250
(482.5-32.5)*5=2250
(450.0)*5=2250
2250.0=2250
ok