Question

Between $2$ o'clock to $10$ o'clock, how many times the hands of a clock are at right angle?

• A. $14$
• B. $12$
• C. $16$
• D. $15$

Answer 1

The correct option is A $14$

Between $2$ & $4$ o'clock and $8$ & $10$ o'clock, the hands are at right angle thrice in each case.

Between $4$ and $8$ o'clock, the hands are at right angles eight times.

So, total number of times the hands are at right angles $=3+3+(2\times 4)=14$.