Algebra.Com's Answer #817310 by ikleyn(52790)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "A plane can fly 1190 miles in the same time as it takes a car to go 280 miles.
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document.write( "If the car travels 130 mph slower than the plane, find the speed of the plane.
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document.write( "Let x be the speed of the plane, in miles per hour.\r\n" );
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document.write( "Then the speed of the car is (x-130) mph, according to the condition.\r\n" );
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document.write( "Next, you write the \"time\" equation, following the problem's description\r\n" );
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document.write( "  =  .\r\n" );
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document.write( "To solve it, cross multiply and simplify\r\n" );
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document.write( " 1190*(x-130) = 280x\r\n" );
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document.write( " 17*(x-130) = 4x <<<---=== after dividing both sides by 70\r\n" );
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document.write( " 17x - 17*130 = 4x\r\n" );
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document.write( " 17x - 4x = 17*130\r\n" );
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document.write( " 13x = 17*130\r\n" );
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document.write( " x = 17*10 = 170.\r\n" );
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document.write( "ANSWER. The plane speed is 170 miles per hour.\r\n" );
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document.write( "CHECK. The plane time is  = 7 hours.\r\n" );
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document.write( " The car time is  =  = 7 hours. ! The same time. Correct !\r\n" );
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document.write( "Solved.\r
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