document.write( "Question 1117143: during a long distance race a competitor traveled a total of 28 kilometers over 8 hours. 18 k were traveled on river one and 10 k on river two. on the first river the competitor traveled an average of 4 k per hour greater than she traveled on the second river. what was the average speed of the competitor on the first river? \n" ); document.write( "
Algebra.Com's Answer #732124 by ikleyn(52908)\"\" \"About 
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document.write( "Let x be the rate on the first river.\r\n" );
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document.write( "Your \"time\" equation is\r\n" );
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document.write( "\"18%2Fx\" + \"10%2F%28x-4%29\" = 8   hours.\r\n" );
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document.write( "It is \"time\" equation, because each fraction in the left side represents the time traveled on corresponding river.\r\n" );
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document.write( "To solve it, multiply both sides by x*(x-4). You will get a quadratic equation.\r\n" );
document.write( "Simplify it and solve it by any method you know/(you like).\r\n" );
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document.write( "The answer is x= 6 kilometers per hour.  (I solved it mentally).\r\n" );
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