Question 119179
255/1.7=150 MPH FOR THE SPEED WITH A HEAD WIND.
255/1.5=170 MPH FOR THE TRIP WITH THE WIND.
THE DIFFERENCE IN SPEEDS DIVIDED BY 2 GIVES US THE WIND SPEED.
(170-150)/2=20/2=10 MPH FOR THE WIND SPEED.
170-10=160 FOR THE PLANE SPEED. 
150+10=160