document.write( "Question 906664: Stephanie runs to the top of a hill and back down again. She runs at 3.5 miles per hour up the hill and 4 miles per hour down the hill. If the total round trip takes 2 hours, how many minutes did it take Stephanie from the top of the mountain back to the bottom? \n" ); document.write( "
Algebra.Com's Answer #550018 by richwmiller(17219)![]() ![]() You can put this solution on YOUR website! x+y=2 \n" ); document.write( "x=2-y \n" ); document.write( "3.5*x=d \n" ); document.write( "3.5*(2-y)=d \n" ); document.write( "4*y=d \n" ); document.write( "3.5*(2-y)=4*y \n" ); document.write( "7.0-3.5y=4*y \n" ); document.write( "7.0=7.5*y \n" ); document.write( "7.0/7.5=y \n" ); document.write( "y=7.0/7.5 \n" ); document.write( "y=0.93333333 hours down \n" ); document.write( "y time =56.0 minutes down \n" ); document.write( "x=1.06666667 hours up \n" ); document.write( "x time =64.0 minutes up \n" ); document.write( "One way up distance = 3.73333333 miles \n" ); document.write( "One way down distance = 3.73333333 miles \n" ); document.write( " \n" ); document.write( " |