document.write( "Question 971576: Bob walked a total of 2.5 miles on a treadmill He walked 2 mikes per hour for one third of the time and 4 miles per hour for two third of the time. What amount of time did he walk on treadmill
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Algebra.Com's Answer #594002 by josmiceli(19441)\"\" \"About 
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Let \"+d+\" = distance Bob walked at \"+2+\" mi/hr
\n" ); document.write( "\"+2.5+-+d+\" = distance he walked at \"+4+\" mi/hr
\n" ); document.write( "Let \"+t+\" = total time he walked on treadmill
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\n" ); document.write( "Walking at 2 mi/hr:
\n" ); document.write( "(1) \"+d+=+2%2A%28+1%2F3+%29%2At+\"
\n" ); document.write( "Walking at 4 mi/hr
\n" ); document.write( "(2) \"+2.5+-+d+=+4%2A%28+2%2F3+%29%2At+\"
\n" ); document.write( "---------------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) \"+2.5+-+2%2A%281%2F3%29%2At+=+4%2A%28+2%2F3+%29%2At+\"
\n" ); document.write( "(2) \"+%28+8%2F3+%29%2At+%2B+%28+2%2F3+%29%2At+=+2.5+\"
\n" ); document.write( "(2) \"+%28+10%2F3+%29%2At+=+10%2F4+\"
\n" ); document.write( "(2) \"+t%2F3+=+1%2F4+\"
\n" ); document.write( "(2) \"+t+=+3%2F4+\"
\n" ); document.write( "He was on the treadmill for 3/4 hr or 45 min
\n" ); document.write( "check:
\n" ); document.write( "(1) \"+d+=+2%2A%28+1%2F3+%29%2At+\"
\n" ); document.write( "(1) \"+d+=+2%2A%28+1%2F3+%29%2A%283%2F4%29+\"
\n" ); document.write( "(1) \"+d+=+1%2F2+\" mi
\n" ); document.write( "and
\n" ); document.write( "(2) \"+2.5+-+d+=+4%2A%28+2%2F3+%29%2At+\"
\n" ); document.write( "(2) \"+2.5+-+1%2F2+=+4%2A%28+2%2F3+%29%2At+\"
\n" ); document.write( "(2) \"+2+=+4%2A%28+2%2F3+%29%2At+\"
\n" ); document.write( "(2) \"+6+=+8t+\"
\n" ); document.write( "(2) \"+t+=+3%2F4+\" hr
\n" ); document.write( "OK\r
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