document.write( "Question 1165986: its nine o'clock . how long will it be before both hands are pointing in the same direction? \n" ); document.write( "
Algebra.Com's Answer #790484 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "In 12 hours, the hour hand makes one revolution while the minute hand makes 12. So the two hands will be pointing in the same direction 11 times in every 12 hours. \n" ); document.write( "Since the rates of the two hands are constant, that means the interval between successive times that the two hands are pointing in the same direction is 12/11 hours. \n" ); document.write( "The two hands are pointing in the same direction at 12:00. \n" ); document.write( "The first time after 9:00 that the two hands are pointing in the same direction is 9(12/11) hours after 12:00. That is 108/11 hours, or 9 9/11 hours after 12:00, or 9/11 hours after 9:00. \n" ); document.write( "ANSWER: The two hands will be pointing in the same direction 9/11 hours after 9:00. \n" ); document.write( "That is 540/11 minutes, or 49 1/11 minutes, or 49 minutes 5 seconds (to the nearest second) after 9:00. \n" ); document.write( " \n" ); document.write( " |