When are clock hands at right angles?
How many times do the hour and minute hands form a right angle between noon and midnight? From the free puzzle set on Think Fanny — next try Odd one out: 3, 5, 7, 9, 11, 13.

How many times do the hour and minute hands form a right angle between noon and midnight? From the free puzzle set on Think Fanny — next try Odd one out: 3, 5, 7, 9, 11, 13.
