document.write( "Question 513272: A boy riding a bicycle travels at ten miles per hour for three hours. He stops to rest for one hour and then continues his ride. For the next hour he rides at a speed of twenty miles per hour. During this ride, what was the rider's average speed for the five hour period? \n" ); document.write( "

Algebra.Com's Answer #342938 by josmiceli(19441) $\"\"$ $\"About$

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Average speed is ( total distance ) / ( total time )
\n" ); document.write( "During the 1st 3 hrs:
\n" ); document.write( " $\"+d+=+10%2A3+\"$
\n" ); document.write( " $\"+d+=+30+\"$ mi
\n" ); document.write( "During the last hour:
\n" ); document.write( " $\"+d+=+20%2A1+\"$
\n" ); document.write( " $\"+d+=+20+\"$ mi
\n" ); document.write( "Average speed =
\n" ); document.write( " $\"+%28+30+%2B+20+%29+%2F+%28+3+%2B+1+%2B+1+%29+\"$
\n" ); document.write( " $\"+50+%2F+5+=+10+\"$
\n" ); document.write( "10 mi/hr \n" ); document.write( "

\n" );