Question

number of times since midday to midnight so that two hands of clock will be perpendicular ​

Answer 1

Answer:

Between two meets they make a right angle exactly twice, this is 11*2 = 22 times right angle per 12h. Now we have 22*2 = 44 times per 24h. And yes, we can double since at 12pm the two heads are one above the other as in the very start at 12am. I think the total number of times, clock hands are perpendicular is 22.