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Richard needs to fly from San Diego to Halifax, Nova Scotia and back in order to give an important talk about mathematics. On the way to Halifax, he will get a speed boost from the wind which blows at \(120\) miles per hour (mph). On the way back, the plane must, unfortunately, fight this wind speed. If the talk lasts \(3\) hours, and if the distance between the two cities is 3600 miles, how fast must the plane fly in mph if the entire trip is to take 13 hours?

 Mar 6, 2022
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Let the speed of the plane from San Diego to Halifax ==S


3600 / [S + 120] + 3600 / [S -  120]==10, solve for S


You will have to use the quadratic formula to get:


S==739.47 mph - the plane's speed.

 Mar 6, 2022

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