Answer
25 miles/hour
Explanation
Given that,
A pilot can travel with wind = 416miles
A pilot can travel against wind = 336miles
A pilot can speed without wind = 235miles/hour
let wind speed = v miles/hr
pilot's speed with the wind = 235+ v
pilot's speed against the wind = 235 - v
Time = distance / speed
416 / (235 + v) = 336 / (235 - v)
416(235 - v) = 336(235+v)
97760 - 416v = 78960 + 336v
97760 - 78960 = 416v + 336v
18800 = 752v
v = 18800/752
v = 25 miles/hour
wind speed = 25 mph
