At what time does it happens puzzle
Sometime during every hour the minute hand lies directly above the hour hand.
At what time between 4 and 5 o’clock does this happen?
240/11 minutes after 4 o clock
i answered first
Answer – 04 : 21 : 48.9942
Let’s start with 12.00 o clock… Both hands overlap…
Let an hour pass….. Min hand will point to 12 again…. But in the mean time, hours hand would move to 1 (from 12 to 1)….
So min hand must move from 12 to 1 ( it takes 5 min or 300 seconds)
But hours hand also over in that time. It moves by
300 * 0.0083 = 2.5 degrees
To cover up that 2.5 degrees, min Hand takes 2.5/0.1 = 25 seconds…
But in that 25 seconds, hour hands move by 25 * 0.0083 = 0.2075 degrees…
To cover up that 0.2 degrees it takes 2.075 degrees…..
And keep continuing thus was….
Total approx time is 25 +2.075. ,0.17+0.00141+0.00117+0.00097 = 27.24855 seconds
Every 65 min 27.24855 seconds once they overlap…..
Let’s continue… After an hour(60 min) , min hand would be at 1 and hour hand would have moved to 2 … So five more min to compensate it…
At 2.10 they over lap again….
So every 65 min 27.24855 seconds once they over lap….
So let’s calculate…
12 : 00 : 00
01 : 05 : 27.24855
02 : 10 : 54.7971
03 : 16 : 21.74565
04 : 21 : 48.9942
05 : 27 : 16.24275
So the answer is 04 : 21 : 48.9942
Your Answer
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