document.write( "Question 938478: I am trying to answer this question, but cannot understand it fully. If I cycle at 4 mph uphill, and 12 mph downhill, what is the average speed?
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Algebra.Com's Answer #571742 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Distance=Rate*Time
\n" ); document.write( "Assume the distance is D.
\n" ); document.write( " $\"D=R%2At\"$
\n" ); document.write( "So uphill,
\n" ); document.write( " $\"D=4t\"$
\n" ); document.write( " $\"t=D%2F4\"$
\n" ); document.write( "and downhill,
\n" ); document.write( " $\"D=12t\"$
\n" ); document.write( " $\"t=D%2F12\"$
\n" ); document.write( "Average speed is total distance over total time.
\n" ); document.write( "You travel a total of $\"2D\"$
\n" ); document.write( "and it took $\"D%2F4%2BD%2F12\"$ in time so,
\n" ); document.write( " $\"S=%282D%29%2F%28D%2F4%2BD%2F12%29\"$
\n" ); document.write( " $\"S=%282D%29%2F%28%283%2F12%29D%2BD%2F12%29\"$
\n" ); document.write( " $\"S=%282D%29%2F%28%284%2F12%29D%29\"$
\n" ); document.write( " $\"S=%282D%29%2F%28D%2F3%29\"$
\n" ); document.write( " $\"S=6\"$ $\"mph\"$ \r
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