How many times are the hands of a clock at right angle in a day? Select
A) 11	B) 22	C) 33	D) 44	E) 55
Sol.   In 12 hours, they are at right angles 22 times.   ∴ In 24 hours, they are at right angles 44 times.   Answer 44
<result>D</result>
How many times are the hands of a clock at right angle in a day?