document.write( "Question 792484: A girl goes to her school from her home at 3 km/h and come back from her school at 2 km /h she takes total 5 hourse time then what is the distance between her home and the school? \n" ); document.write( "
Algebra.Com's Answer #480032 by Alan3354(69443)\"\" \"About 
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A girl goes to her school from her home at 3 km/h and come back from her school at 2 km /h she takes total 5 hourse time then what is the distance between her home and the school?
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\n" ); document.write( "Avg speed of a round trip is
\n" ); document.write( "2*r1*r2/(r1+r2)
\n" ); document.write( "= 2*3*2/(3+2) = 12/5
\n" ); document.write( "= 2.4 km/hr
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\n" ); document.write( "d = r*t = 2.4*5 = 12 km RT
\n" ); document.write( "One way = 6 km
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\n" ); document.write( "Avg speed of a round trip is
\n" ); document.write( "2*r1*r2/(r1+r2)
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\n" ); document.write( "That can be derived easily by picking a distance, eg, 6 km.
\n" ); document.write( "It's not possible (or recommended) to remember all the formulas, but this one is similar to parallel resistors, parallel flows, and \"parallel\" work. It has an additional factor of 2 in the numerator.
\n" ); document.write( "2*r1*r2/(r1+r2)
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\n" ); document.write( "Parallel resistors is
\n" ); document.write( "R1*R2/(R1+R2) \n" ); document.write( "
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