document.write( "Question 1104980: A plane traveled 2610 miles with the wind in 4.5 hours and 1980 miles against the wind in the same amount of time. Find the speed of the plane in still air and the speed of the wind. \n" ); document.write( "
Algebra.Com's Answer #719718 by stanbon(75887)\"\" \"About 
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A plane traveled 2610 miles with the wind in 4.5 hours and 1980 miles against the wind in the same amount of time. Find the speed of the plane in still air and the speed of the wind.
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\n" ); document.write( "With-wind DATA:
\n" ); document.write( "dist = 2610 miles ; time = 4.5 hrs ; rate = 2610/4.5 = 580 mph
\n" ); document.write( "Against-wind DATA:
\n" ); document.write( "dist = 1980 miles ; time = 4.5 hrs ; rate = 440 mph
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\n" ); document.write( "Equation:
\n" ); document.write( "p + w = 580
\n" ); document.write( "p - w = 440
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\n" ); document.write( "Add the two equations to get:
\n" ); document.write( "2p = 1020
\n" ); document.write( "plane = 510 mph (rate in still air)
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\n" ); document.write( "Subtract one equation from the other to get:
\n" ); document.write( "2w = 140 mph
\n" ); document.write( "w = 70 mph (rate of wind)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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