document.write( "Question 350114: solve (a plane flys 2400 miles one way and takes 4 hours, then fly's back the same way and takes an hour and a half longer. what is the speed of the plane in still air and what is the wind speed? \n" ); document.write( "
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solve (a plane flys 2400 miles one way and takes 4 hours, then fly's back the same way and takes an hour and a half longer. what is the speed of the plane in still air and what is the wind speed?
\n" ); document.write( "..
\n" ); document.write( "2400 miles = 4 hours
\n" ); document.write( "speed = distance /time
\n" ); document.write( "speed = 600 mph
\n" ); document.write( "..
\n" ); document.write( "2400 miles 5 1/2 hours = 11/2 hours
\n" ); document.write( "speed = distance /time
\n" ); document.write( "speed = 2400/(11/2)
\n" ); document.write( "=2400 *2/11
\n" ); document.write( "4800/11
\n" ); document.write( "=436.36 mph
\n" ); document.write( "..
\n" ); document.write( "let speed in still air be x
\n" ); document.write( "let speed of wind = y
\n" ); document.write( "...
\n" ); document.write( "x+y =600
\n" ); document.write( "x-y = 436
\n" ); document.write( "Add the equations
\n" ); document.write( "2x=1036
\n" ); document.write( "x= 1036/2
\n" ); document.write( "x= 518 mph
\n" ); document.write( "y = 600-518 = 82 mph \n" ); document.write( "
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