document.write( "Question 931788: At max speed an airplane travels 1680 miles on 5 hours. Flying with the wind it travels the same distance in 4 hours. What is the speed of the plane without the wind, and what is the wind speed. \n" ); document.write( "

Algebra.Com's Answer #565801 by TimothyLamb(4379) $\"\"$ $\"About$

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x = speed of airplane in still air = 1680/5 = 336 mph
\n" ); document.write( "y = speed of wind
\n" ); document.write( "---
\n" ); document.write( "s = d/t
\n" ); document.write( "---
\n" ); document.write( "with the wind:
\n" ); document.write( "x + y = 1680/4
\n" ); document.write( "336 + y = 1680/4
\n" ); document.write( "y = 1680/4 - 336
\n" ); document.write( "y = 84
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "x = speed of airplane in still air 336 mph
\n" ); document.write( "y = speed of wind = 84 mph
\n" ); document.write( "---
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