Question

Choose those times at which the minute hand of a clock is perpendicular to the hour hand.

• A. 4:00
• B. 9:00
• C. 6:30
• D. 3:30

Answer 1

The correct option is B 9:00

At 9'o clock:
the hour hand is at 9 and the minute hand is at 12.
Hence, the angle between them is 90 degree and this implies the minute hand of a clock is perpendicular to the hour hand at 9:00.