document.write( "Question 1014218: A dog ran at 30 km/hr for 40 minutes and then returned to the starting point at 20 km/hr.find it's average speed \n" ); document.write( "

Algebra.Com's Answer #630546 by josmiceli(19441) $\"\"$ $\"About$

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Convert minutes to hrs
\n" ); document.write( " $\"+40%2F60+=+2%2F3+\"$ hrs
\n" ); document.write( "The one-way distance is:
\n" ); document.write( " $\"+d+=+30%2A%282%2F3%29+=+20+\"$ km
\n" ); document.write( "and, for the return to start:
\n" ); document.write( " $\"+20+=+20%2At+\"$
\n" ); document.write( " $\"+t+=+1+\"$ hr
\n" ); document.write( "-------------
\n" ); document.write( "Average speed is always
\n" ); document.write( "[ total distance ] / [ total time ]
\n" ); document.write( " $\"+%28+20+%2B+20+%29+%2F+%28+2%2F3+%2B+1+%29+\"$
\n" ); document.write( " $\"+40%2F%28+5%2F3+%29+\"$
\n" ); document.write( " $\"+%283%2F5%29%2A40+=+24+\"$
\n" ); document.write( "The average speed is 24 km/hr \n" ); document.write( "

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