doubt
Crazy Voyager,
Actually, I can't get down to figuring it out. If the plane (traveling at 180mph) takes the same time to travel 7 miles as it does 5, the difference in speed is 50mph and not 30.
Since (t=d/s=) 7/180=0,038 and to calculate the speed at which the plane went at to travel 5 miles in 0,038, we get it went at 130mph... Therefore 180-130=50mph. From where 50mph is the speed of the wind againts the plane... Doesn't this sound right?
To ZOOKER: the fact is to prepare for the numerical test since you are asked to solve problems of this type without prejudice of you ever been asked to resolve this kind of stuff in the real screen scenario.