document.write( "Question 1092797: A man drives 80km/h to Selfoss and 60km/h from Selfoss. What is the average speed? The answer is not 70km/h \n" ); document.write( "
Algebra.Com's Answer #707452 by ikleyn(52782)\"\" \"About 
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\n" ); document.write( "At given condition there is no a unique answer.\r
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\n" ); document.write( "\n" ); document.write( "From the other side (or in contrast), it can be solved and has a unique answer under the assumption that
\n" ); document.write( "the distance \"to there\" is equal to the distance back, but it is not stated explicitly in the condition.\r
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\n" ); document.write( "\n" ); document.write( "Lesson to learn from my explanation:\r
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\n" ); document.write( "\n" ); document.write( "                Learn how to formulate Math problems correctly !\r
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\n" ); document.write( "Also see the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Calculating an average speed: a train going from A to B and back \r
\n" ); document.write( "\n" ); document.write( "    - One more problem on calculating an average speed \r
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