document.write( "Question 1149780: Hi\r
\n" ); document.write( "\n" ); document.write( "a student was driving to school at 50mph. A quarter of the way he ran out of petrol. If he ran the rest of the way at 10mph what was his average speed.\r
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Algebra.Com's Answer #771112 by ikleyn(52765) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "a student was driving to school at 50mph. A quarter of the way he ran out of petrol.
\n" ); document.write( "If he ran the rest of the way at 10mph what was his average speed.
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document.write( "Let \" d \" be the full distance.\r\n" );
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document.write( "Then the time to drive   =  =  hours;\r\n" );
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document.write( "     the time to run     =  =  hours.\r\n" );
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document.write( " =  =  =  =  =  =  = 25 miles per hour.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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\n" ); document.write( "\n" ); document.write( "After reading the note from @greenestamps:\r
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document.write( "    dear greenestamps, you are not right (!!)\r\n" );
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document.write( "    The problem says it directly and explicitly :  \" . . .  A quarter of the way  he ran out of petrol.\"\r\n" );
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document.write( "    Not a quarter of the time . . . \r\n" );
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\n" ); document.write( "\n" ); document.write( "My solution is correct (!)\r
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