document.write( "Question 1084562: Joe and Ann rode their tandem bike uphill for 6 miles at a speed of 10 miles per hour. They rode back down along the same route at a rate of 15 miles per hour. What was their aver- age speed and how long were they riding? \n" ); document.write( "
Algebra.Com's Answer #698644 by jorel1380(3719)\"\" \"About 
You can put this solution on YOUR website!
6 miles x 1 hr/10 miles=.6 hours
\n" ); document.write( "6 miles x 1 hr/15 miles=.4 hours
\n" ); document.write( "12 miles/(.6+.4)hrs=12 miles hour
\n" ); document.write( "They rode for 1 hour, total, at an average speed of 12 mph. ☺☺☺☺
\n" ); document.write( "
\n" );