Question 1074632
Let w be the speed of the wind. Then, with the wind, the plane flies 250+w,and, against the wind, the plane flies 250-w. So:
290/250-w + 710/250+w =4
72500+290w+177500-710w=4(62500-w²)
250000-420w=250000-4w²
4w²=420w
w²=105w
w=105
The speed of the wind is 105 kph. &#9786;&#9786;&#9786;&#9786;