document.write( "Question 728685: You travel up a hill at 10mph. You travel down the hill at 30mph. What was your average speed? \n" ); document.write( "

Algebra.Com's Answer #445558 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Average speed is ( total distance ) /( total time )
\n" ); document.write( "Going up:
\n" ); document.write( " $\"+d+=+10t%5B1%5D+\"$
\n" ); document.write( " $\"+t%5B1%5D+=+d+%2F+10+\"$
\n" ); document.write( "Going down:
\n" ); document.write( " $\"+d+=+30t%5B2%5D+\"$
\n" ); document.write( " $\"+t%5B2%5D+=+d+%2F+30+\"$
\n" ); document.write( "-----------------
\n" ); document.write( " $\"+2d+%2F+%28+t%5B1%5D+%2B+t%5B2%5D+%29+=+2d+%2F+%28+d%2F10+%2B+d%2F30+%29+\"$
\n" ); document.write( " $\"++2d+%2F+%28+d%2F10+%2B+d%2F30+%29+=+2+%2F+%28+1%2F10+%2B+1%2F30+%29+\"$
\n" ); document.write( " $\"+2+%2F+%28+3%2F30+%2B+1%2F30+%29+\"$
\n" ); document.write( " $\"+2+%2F+%28+4%2F30+%29+=+60%2F4+\"$
\n" ); document.write( " $\"+60%2F4+=+15+\"$
\n" ); document.write( "The average speed is 15 mi/hr\r
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