twice an hour, at the 15 minute mark and 45 minute mark.
twice if you're looking for exact right angles
At nine o'clock and three o'clock
in a half day it occur or happens 22 times
At one time, a clock would make 4 right angles. But looking at it many times, you will feel that it makes not 4 but more than 4. App infinite.
The hands of the clock will form a straight line 12 times.
It's not 16 times! The answer is 44 times!
if the clock on has 2 hands : hands would change 1440 timesif you use the second hand; it would move a total of 44640 times
All 3 hands overlap 24 times a day.
An infinite number of times.
They overlap 11 times.