Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 11)
11.
How many times are the hands of a clock at right angle in a day?
Answer: Option
Explanation:
In 12 hours, they are at right angles 22 times.
In 24 hours, they are at right angles 44 times.
Discussion:
80 comments Page 3 of 8.
Tarun parihar said:
1 decade ago
3:00 and 9:00 are common so in 12 hours is 22 time or in 24 hours is 44 times.
Raju said:
1 decade ago
Actually in general for every hour the right angle comes in two times.
So, the answer should be 2*12*2 = 48 times.
But the logical thing here is for 2 o clock and 3 o'clock, one right angle coincides,
Similarly for 8 and 9 o'clock another right angle coincides.
So, the final answer is 48-2 = 44
So, the answer should be 2*12*2 = 48 times.
But the logical thing here is for 2 o clock and 3 o'clock, one right angle coincides,
Similarly for 8 and 9 o'clock another right angle coincides.
So, the final answer is 48-2 = 44
Sonu Choudhary said:
1 decade ago
If you switch to a rotating coordinate system in which the hour hand stands still, then the minute hand makes only 11 revolutions, and so it is at right angles with the hour hand 22 times.
In a 24 hour day you get 2*22 = 44.
In a 24 hour day you get 2*22 = 44.
Osh said:
1 decade ago
How many times in a day do the hands of a clock form an angle of 45 degrees?
I know the answer is 44 times. But what is the reason?
I know the answer is 44 times. But what is the reason?
Manjunathan said:
1 decade ago
One full rotation not considered so 11*2*2 = 44.
Sanvi said:
1 decade ago
How can it be 22? And more over even at 8 and 2'O clock right angles will occur.
Please give the exact explanation.
Please give the exact explanation.
Shanmugam said:
1 decade ago
How is answer come for 44?
Miss clock said:
10 years ago
At 00.15 the minute hand has moved 90′ &the hour hand has also moved 7.5′. Thus they don't make a right angle.
Himanshu said:
10 years ago
@Shawisk. The question is absurd. Because even at 1:20, the hr hand will be slightly ahead of 1 while minute hand will be at 4. Therefore making an angle of less than 15. Kindly help.
Ram said:
10 years ago
How many right angles does the hour hand of a clock move, when it goes from 12 to 3?
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