Question

At which of the times shown in the options, will the hour hand and the minute hand of your clock 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 $09:00$, the hour hand and minute hand are at right angles to each other. At all 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.