document.write( "Question 1149743: Every day Mike leaves his farm at 11:30 a.m. to take a load of potatoes to the chip producers. If he averages 50 km/h he arrives at 1:54 p.m., but if he averages 80 km/h he arrives at 1 p.m. At what speed must he travel to arrive at 12:45 p.m.? \n" ); document.write( "

Algebra.Com's Answer #771084 by ikleyn(53763) $\"\"$ $\"About$

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document.write( "From 11:30 am to 1:54 pm, the time is  +  = 0.5 + 1.9 = 2.4 hours.\r\n" );
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document.write( "At the average rate of 50 km/h, the distance is  2.4*50 = 120 kilometers.\r\n" );
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document.write( "From 11:30 am to 12:45pm, the time is   +  =  = 1.25 hours.\r\n" );
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document.write( "Hence, the required average rate under the question is   = 96 km/h.  ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "Notice that this fragment in the problem's condition \"but if he averages 80 km/h he arrives at 1 p.m.\" is EXCESSIVE info. \r
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\n" ); document.write( "\n" ); document.write( "It is NOT NECESSARY and is not used in the solution.\r
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