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Square Time (Posted on 2005-10-04) Difficulty: 2 of 5
The current time is between 1 o’clock and 12 o’clock in a wallclock and both the minute hand and the hour hand are situated precisely on two distinct minute marks. It is observed that the hour hand is a square number of minute marks ahead of the 12 Hour Mark . The number of minute marks by which the hour hand is ahead of the minute hand is a different perfect square greater than 1. Determine the current time from the information provided in the above statements.

See The Solution Submitted by K Sengupta    
Rating: 3.0000 (3 votes)

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Solution It was fun to solve Comment 3 of 3 |

For each minute mark moved by the hour hand, the minute hand moves twelve marks.  The hour hand is a perfect square number of marks from 12 only at these five times:

12:12
12:48
3:12
5:00
9:48

The first two violate the restriction "the current time is between 1 o'clock and 12 o'clock";  At 5:00, the two perfect squares involved are the same, violating another restriction;  At 9:48 the distance between the hour hand and minute hand is 1 mark, violating the "perfect square greater than one" restriction.  The only time that fits all the requirements is 3:12.

 


  Posted by Mindy Rodriguez on 2005-11-11 15:15:31
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