document.write( "Question 479227: Elaine jogs and walks to office every day. she averages 4km/hr walking and 8 km/hr jogging. the distance from her house to the office is 6km and she makes a trip in 1 hr. how far does she jog in a trip. \n" ); document.write( "

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Elaine jogs and walks to office every day.
\n" ); document.write( " she averages 4km/hr walking and 8 km/hr jogging. the distance from her house to the office is 6km and she makes a trip in 1 hr.
\n" ); document.write( " how far does she jog in a trip.
\n" ); document.write( ":
\n" ); document.write( "Let j = jogging dist
\n" ); document.write( "then
\n" ); document.write( "(6-j) = walking dist
\n" ); document.write( ":
\n" ); document.write( "Write a time equation, time = dist/speed
\n" ); document.write( ":
\n" ); document.write( "jog time + walk time = 1 hr
\n" ); document.write( " $\"j%2F8\"$ + $\"%28%286-j%29%29%2F4\"$ = 1
\n" ); document.write( "multiply eq by 8 to clear the denominators, results:
\n" ); document.write( "j + 2(6-j) = 8
\n" ); document.write( "j + 12 - 2j = 8
\n" ); document.write( "j - 2j = 8 - 12
\n" ); document.write( "-j = -4
\n" ); document.write( "j = 4 km his jogging dist
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "check this find the time of each
\n" ); document.write( "4/8 + 2/4 = 1
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