Adding Reply Archived Topic: It will not be bumped to the top of the forum. Topic Please Help meee! Membername   Not a member? Sign Up Free (takes 20 seconds) Password   Forgotten your password? Post Font: Verdana Arial Black Georgia Comic Sans Impact   Size: Tiny Normal Big Huge   Color: Default Dark Red Red Orange Brown Green Olive Cyan Blue Dark Blue Indigo Black [ Check Spelling ] [ Post Preview ] [ LiveTags ] FAQ Keyword Search: Post Options Favorites Manager Notify me of new replies to this topic by email Notify me of new replies to this topic by private message Original Post CaptainUnderpants Posted at 5:02 pm on May 30, 2008 A plane can fly 480 miles per hour (mph) when there is no wind. If there is wind blowing at a constant rate, the plane can fly 618 miles downwind in the same amount of time it can fly 534 miles upwind. Find the speed of the wind. Hint: when flying downwind, the speed of the plane increases by the amount of the windspeed. When flying upwind, the plane's speed decreases by the same amount.

Replies Khadgar Posted at 5:16 pm on May 30, 2008 Continuing, 534(480 + x) = 618(480 - x) 256320 + 534x = 296640 - 618x 1152x = 40320 x = 35 The speed of the wind is 35 miles per hour. CaptainUnderpants Posted at 5:07 pm on May 30, 2008 Quote: from Khadgar at 8:06 pm on May 30, 2008 618____-color=green==_____534 (480 + x)__(480-x) thanks a fuckin lot. Khadgar Posted at 5:06 pm on May 30, 2008 You know that the plane could travel 618 miles at the downwind speed in the same time that it could travel 534 miles at the upwind speed. The speed of the plane with no wind is 480 miles an hour, so lets let the speed of the wind be x. Therefore, the speed of the plane downwind is 480 + x, and the speed of the plane upwind is 480 - x. 618 / (480 + x) = 534 / (480-x) Solve for x. All 3 previous replies displayed.