Problema Solution
A plane flies 450 miles with the wind and 330 miles against the wind in the same length o time. If the wind is 20 mph, what is the speed of the wind?
Answer provided by our tutors
let speed of plane be x mph
450/(x+20) = 330/(x-20)
450x-9000 = 330x+6600
120x = 15600
x = 15600/120 = 130 mph