document.write( "Question 1136891: Alice is in a 20-km running race. She always runs the first half at an average speed of 2 km/h faster than the second half. Let x represent her speed in the first half. Determine a simplified expression in terms of x for the total time needed for a race. I wrote this 20/x(x-2) but I can't do anything with it and it's incorrect. \n" ); document.write( "

Algebra.Com's Answer #754725 by ikleyn(52890) $\"\"$ $\"About$

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document.write( "One half of the race is 20/2 = 10 kilometers, same as the second half.\r\n" );
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document.write( "The time spent on the first half is    hours.\r\n" );
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document.write( "The time spent on the second half is    hours  (since the speed there is (x-2) km/h).\r\n" );
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document.write( "Hence, the total time expression is\r\n" );
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document.write( "    Total time =  +     hours.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Having this basic expression, you can transform it in any (equivalent) way, on your choice.\r
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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