document.write( "Question 1157811: Vinnie drives his car 175 miles and has an average of a certain speed. If the average speed had been 4mph more, he could have traveled 189 miles in the same length of time. What was his average speed?\r
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Algebra.Com's Answer #780684 by ikleyn(52864) $\"\"$ $\"About$

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document.write( "Let x be his average speed.\r\n" );
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document.write( "Then the other speed is (x+4) mph.\r\n" );
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document.write( "From the condition, you have this equation\r\n" );
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document.write( "     = .\r\n" );
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document.write( "Cross multiply, simplify and solve for x\r\n" );
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document.write( "    175*(x+4) = 189x\r\n" );
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document.write( "    175x + 4*175 = 189x\r\n" );
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document.write( "    4*175 = 189x - 175x\r\n" );
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document.write( "    4*175 = 14x\r\n" );
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document.write( "    x     =  = 50.\r\n" );
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document.write( "ANSWER. The average speed was 50 miles per hour.\r\n" );
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