document.write( "Question 946442: Between the times 830 am and 3:30 pm, how many times will the hour and minute hands form a right angle on a clock face?\r
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\n" ); document.write( "\n" ); document.write( "Between the times 830 am and 3:30 pm, how many times will the hour and minute hands form a right angle on a clock face?\r
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\n" ); document.write( "\n" ); document.write( "a. 2\r
\n" ); document.write( "\n" ); document.write( "b. 5\r
\n" ); document.write( "\n" ); document.write( "c. 11\r
\n" ); document.write( "\n" ); document.write( "d. 12\r
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\n" ); document.write( "\n" ); document.write( "My answer is a but in the book answer is d.
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Algebra.Com's Answer #577381 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
Assume the big hand only moves on the hour.
\n" ); document.write( "So at 9:00, they would be at right angles, at 9:30.
\n" ); document.write( "10:05 and 10:35
\n" ); document.write( "11:10 and 11:40
\n" ); document.write( "12:15 and 12:45
\n" ); document.write( "1:20 and 1:50
\n" ); document.write( "2:25 and 2:55
\n" ); document.write( "That makes the 12 times.
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\n" ); document.write( "\n" ); document.write( "If the big hand moves with the hour, then the timing is off by a little.
\n" ); document.write( "9:00 would still be good but it might be 9:32 until it happens again, and so on.
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