document.write( "Question 134451: I am looking for help on this textbook example:
\n" ); document.write( "Every morning, Yong Yi runs 5 miles, then walks one mile. He runs 6 mph faster than he walks. If his total time yesterday was 45 minutes, the how fast did he run? \n" ); document.write( "
Algebra.Com's Answer #98344 by vleith(2983)\"\" \"About 
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Let x = speed walking\r
\n" ); document.write( "\n" ); document.write( "Speed running = (x+6)\r
\n" ); document.write( "\n" ); document.write( "Time = distance/speed\r
\n" ); document.write( "\n" ); document.write( "time = timeRunning + timeWalking
\n" ); document.write( "\"time+=+%285%2F%28x%2B6%29%29+%2B++1%2Fx+\"
\n" ); document.write( "\"time+=+%285x%2B+x%2B6%29%2F%28x%28x%2B6%29%29+\"
\n" ); document.write( "\"%283%2F4%29%28x%5E2+%2B+6x%29+=+6x+%2B+6+\"
\n" ); document.write( "\"3x%5E2+%2B+18x+=+24x+%2B+24\"
\n" ); document.write( "\"3x%5E2+-6x+-+24+=+0+\"
\n" ); document.write( "\"%283x+%2B+6%29%28x-4%29+=+0+\"
\n" ); document.write( "x = -2, x = 4\r
\n" ); document.write( "\n" ); document.write( "since he can't walk at -2, walking speed must be 4mph
\n" ); document.write( "The running is 10mph\r
\n" ); document.write( "\n" ); document.write( "Check your answer. He will run 30 minutes at 10mph to cover 5 miles. He will walk 1 mile in 15 minutes. total 6 miles in 45 minutes. Check!
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