document.write( "Question 833622: A bike trail is 21 miles long. If a biker travels 8mph for the first of the trail and 12 mph for the second part, how far did the biker travel at the slower speed if he traveled for a total of two hours \n" ); document.write( "
Algebra.Com's Answer #502685 by ankor@dixie-net.com(22740)\"\" \"About 
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A bike trail is 21 miles long.
\n" ); document.write( "If a biker travels 8mph for the first of the trail and 12 mph for the second part, how far did the biker travel at the slower speed if he traveled for a total of two hours?
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\n" ); document.write( "Let t = time traveled at 8 mph
\n" ); document.write( "then
\n" ); document.write( "(2-t) = time traveled at 12 mph
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\n" ); document.write( "Write a distance equation; dist = 2peed * time
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\n" ); document.write( "Slow dist + fast dist = 21 mi
\n" ); document.write( "8t + 12(2-t) = 21
\n" ); document.write( "8t + 24 - 12t = 21
\n" ); document.write( "8t - 12t = 21 - 24
\n" ); document.write( "-4t = -3
\n" ); document.write( "t = -3/-4
\n" ); document.write( "t = 3/4 of an hr at the slow speed
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\n" ); document.write( "Check this out, find the dist at each speed, using decimal hrs
\n" ); document.write( "8*.75 = 6 mi
\n" ); document.write( "12*1.25 = 15 mi
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\n" ); document.write( "total d: 21 mi \n" ); document.write( "
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