Question 426571
Let the speed of the plane with no wind = s
Let the speed of the wind = v
The speed against the wind = s - v = 240 mi/1.5 h = 160 mi/h (1)
The speed with the wind = s + v = 240/1 h = 240 mi/h (2)
Subtract (1) from (2):
2v = 80 -> v = 40 mi/h.
Ans: The speed of the wind is 40 mi/h