# 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:

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.

=> 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

The answer is 44.

In 1 hour= 2 times right angle.

But 3:00 and 9:00 is subtracted.

In 1 hour= 2 times right angle.

But 3:00 and 9:00 is subtracted.

Vijay kumar said:
4 years ago

The answer is 22 times.

Mansi said:
4 years ago

A unique clock has 24 divisions instead of 12 nd functions like normal then how many times from noon will the hour and the minute hand form 90 degrees for the first time? Can anyone answer this?

Post your comments here:

Quick links

Quantitative Aptitude

Verbal (English)

Reasoning

Programming

Interview

Placement Papers