donnie1999
  • donnie1999
------------WILL FAN AND MEDAL----------- At maximum speed, an airplane travels 1720 miles against the wind in 5 hours. Flying with the wind, the plane can travel the same distance in 4 hours. Let x be the maximum speed of the plane and y be the speed of the wind. What is the speed of the plane with no wind?
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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donnie1999
  • donnie1999
@pinkbubbles
donnie1999
  • donnie1999
There are no answer choices this time :(
anonymous
  • anonymous
1720/x=5 5x=1720 x=1720/5 x=344 mph against the wind. 1720/y=4 4y=1720 y=1720/4 y=430 mph. with the wind. (430-344)/2 86/2=43 mph. is the speed of the wind. 344+43=387 430-43=387 mph. speed of the plane in still air.

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donnie1999
  • donnie1999
so the answer is 387?
anonymous
  • anonymous
Yup! :)

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