document.write( "Question 856984: Alice is in a 20-km race. She always runs the first half at an average speed of 2 km/h faster than the second half.\r
\n" ); document.write( "\n" ); document.write( "a.) Let 'x' represent her speed in the first half. Determine a simplified expression in terms of 'x' for the total time needed to run the race.\r
\n" ); document.write( "\n" ); document.write( "b.) If Alice runs the first half at 10 km/h, how long will it take her to run the race, to the nearest tenth of an hor. \n" ); document.write( "

Algebra.Com's Answer #516297 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
\n" );
document.write( "Hi,
\n" );
document.write( "Re Reply
\n" );
document.write( "a)  = time
\n" );
document.write( "b)  = 1 + 5/4 hr 0r 2hr 15min
\n" );
document.write( "My set up would have been using (x+2) for the first half speed and x for the second half.
\n" );
document.write( "Result the same, of course. always encourage people to \"write\" as they read.
\n" );
document.write( "  = time
\n" );
document.write( "(x+2) = 10 ⇒  x = 8
\n" );
document.write( "  10/10 + 10/8 = 1 ⁵⁄₄  hr \n" );
document.write( "

\n" );