anonymous
  • anonymous
Plane flies 405 miles with wind and 315 miles against wind in same length of time. If speed of wind is 20 mph, find speed of plane in still air. Show me how to set up? i can solve it :) Thanks!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
I'm confused, i think its supposed to look like rational expression, my teacher taught it that way, i think
apoorvk
  • apoorvk
let the time taken be 't' and plane's actual velocity be 'v' so effectively, with wind, v+20=405/t and against wind, v-20=315/t now solve the equation for 'v' and 't', and enjoy! (post and verify your answer if you need)
anonymous
  • anonymous
Ill solve it, brb

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anonymous
  • anonymous
My answer: 160
anonymous
  • anonymous
that is not what i get time is distance divided by rate so you have to expressions for time \(t=\frac{405}{r+20}=\frac{315}{r-20}\)
anonymous
  • anonymous
|dw:1333459899305:dw|
anonymous
  • anonymous
*two expressions
apoorvk
  • apoorvk
Right-O!!!
anonymous
  • anonymous
yes that should do it!
anonymous
  • anonymous
but i don't thing 160 is the solution
anonymous
  • anonymous
wolfram alpha said it was right, but thank you anyways :)
apoorvk
  • apoorvk
yes @satellite73 i checked it again, its right i believe.
perl
  • perl
apoor, stil there?

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