document.write( "Question 885238: John travelled 30 minutes going 40mph and then slowed down to 20 mph for the remaining 20 minutes. WHat was his average speed in the journey? \n" ); document.write( "

Algebra.Com's Answer #534980 by josmiceli(19441) $\"\"$ $\"About$

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Average speed always equals
\n" ); document.write( "( total distance traveled ) / ( total time spent traveling )
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\n" ); document.write( "Given:
\n" ); document.write( "Total time = $\"+30+%2B+20+=+50+\"$ min
\n" ); document.write( "In hours:
\n" ); document.write( "Total time = $\"+50%2F60+=+5%2F6+\"$ hrs
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\n" ); document.write( "For 1st part of trip:
\n" ); document.write( " $\"+d%5B1%5D+=+40%2A%281%2F2%29+\"$ ( 30 min = 1/2 hr )
\n" ); document.write( " $\"+d%5B1%5D+=+20+\"$ mi
\n" ); document.write( "For 2nd part of trip:
\n" ); document.write( " $\"+d%5B2%5D+=+20%2A%281%2F3%29+\"$ ( 20 min = 1/3 hr )
\n" ); document.write( " $\"+d%5B2%5D+=+20%2F3+\"$ mi
\n" ); document.write( "------------------
\n" ); document.write( "Average speed = $\"+%28%28+d%5B1%5D+%2B+d%5B2%5D+%29%29+%2F+%28+5%2F6+%29+\"$
\n" ); document.write( "Average speed = $\"+%28%28+20+%2B+20%2F3+%29%29+%2F+%28+5%2F6+%29+\"$
\n" ); document.write( "Average speed = $\"+%28+80%2F3+%29%2A%28+6%2F5+%29+\"$
\n" ); document.write( "Average speed = $\"+160%2F5+=+32+\"$
\n" ); document.write( "------------------------------
\n" ); document.write( "His average speed was 32 mi/hr\r
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