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?
22
24
44
48
Explanation:

In 12 hours, they are at right angles 22 times.

In 24 hours, they are at right angles 44 times.

Discussion:
76 comments Page 1 of 8.

Jamshaid said:   5 months ago
Simply speaking, every 15 min (4/Hour) is right angle except at 6 & 12, AM PM both. (24 x 4) - 4.

Rahul said:   8 months ago
At 10 o clock, we can't observe a right angle. Right?

Sathesh said:   1 year ago
At what time 90 degrees formed 11 and 12? Anyone, please explain.

Suvrat Advait said:   2 years ago
It's awesome. Thanks all for explaining.

Amcodes said:   2 years ago
=> When Hour and Min Hand are 15 mins and 45 mins away from each other, they form a right angle. So basically in every 60 min SPACES(not mins), they form right angles 2 times.

=> Let's start from 12 AM (0 degree angle).
55 min spaces are covered in 60 mins.
So 60 min spaces are covered in?
=(60*60)/55 mins.

> In a day there are 24 hours = 24 x 60 mins,
So how many such 60 min spaces exist in a day.
= ( (24*60) / ((60*60)/55)) = 22
So, 22*2 = 44 times they form a Right angle in a day.

Shaikazharuddin said:   2 years ago
Thanks all for explaining.

GAURAV said:   3 years ago
Finally, I agree with @Prashant Kumaar's explanation.

Vivek S said:   4 years ago