document.write( "Question 155510: In a walkathon to raise money for charity, Elisa walked a certain distance at 5 mi/h and then jogged twice that distance at 8 mi/h. Her total time walking and jogging was 2hr and 15min. How many miles long was the walkathon? The answer is 15mi but I cannot formulate the equation. \n" ); document.write( "
Algebra.Com's Answer #114542 by scott8148(6628)\"\" \"About 
You can put this solution on YOUR website!
r*t=d __ so t=d/r __ 2hr15min is 9/4 hr\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"Elisa walked a certain distance at 5 mi/h\" __ Tw=d/5\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"jogged twice that distance at 8 mi/h\" __ Tj=2d/8=d/4\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "the total time is Tw+Tj __ the total distance is 3d\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "d/5+d/4=9/4 __ multiplying by 20 __ 4d+5d=45 __ 9d=45 __ d=5 __ 3d=15
\n" ); document.write( "
\n" );