Question

Identify the instances at which, the hour hand and the minute hand of your clock will be perpendicular to each other?

• A. 09:00
• B. 06:15
• C. 03:45
• D. Both A & B

Answer 1

The correct option is A

09:00

At $03:00$, hour hand and minute hand are at right angles to each other. At all the other instants, the minute hand has moved, so hour hand would haved moved too, right? So, the angle will not be ${90}^{\circ }$ in those cases.