document.write( "Question 626439: For how long does a 24-hour digital watch display at least one digit which is
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\n" ); document.write( "D)55 min
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Algebra.Com's Answer #394168 by Edwin McCravy(20059)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "During the hours 2:05 to 2:59, 3:05 to 3:59, and 4:05 to 4:59 there are \r\n" );
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document.write( "1. minutes :05, :15, :25, :35, :45 amounting to 5 separate minutes\r\n" );
document.write( "2. minutes :50 through :59 amounting to 10 continuous minutes\r\n" );
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document.write( "So during each of those three hours, at least one 5 is displayed 15 \r\n" );
document.write( "minutes,  So that accounts for 45 minutes.\r\n" );
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document.write( "From 5:00 THROUGH 5:55 is 56 continuous minutes.\r\n" );
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document.write( "Therefore a 5 is displayed 45+56 = 101 minutes = 1 hour 41 minutes\r\n" );
document.write( "THROUGH the minute from 5:55 to 5:56.\r\n" );
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document.write( "However the problem states TO 5:55, not THROUGH.  So I guess that means \r\n" );
document.write( "only through 5:54, then the answer is 1 hour 40 minutes. \r\n" );
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document.write( "Edwin
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