question_answer

At what time are the hour hand and the minute hand of a clock perpendicular to each other?

A)  \[1:00\text{ }p.m.\]                

B)  \[3:00\text{ }p.m.\]    

C)    \[4:00\text{ }p.m.\]    

D)    \[6:00\text{ }p.m.\]