A plane traveled 1855 miles with the wind in 3.5 hours and 1715 miles against the wind in the same amount of time. Find the speed of the plane in still air and the speed of the wind

Answer 1

p+w = 1855/3.5 = distance/time =speed = d/r

p-w = 1715/3.5 = (d-140)/3.5

add

2p = 1855/3.5 + 1715/3.5

2p = 530+490 = 1020

p = 510 mph in still air with wind speed = 0

w= 530-510= 20 mph = wind speed