Question

A wall clock takes $10$ seconds to strike $6$ from $1$. How much time it will take to strike $12$ $?$

• A. $21$
• B. $18$
• C. $20$
• D. $22$

Answer 1

Answer: (D)

$22$

Between $1$ o'clock to $6$ o'clock, there are $5$ gaps of time.

Now $5$ intervals of time takes $10$ seconds, so $1$ interval of time takes $2$ seconds, i.e. we hear the strike in a clock after every $2$ seconds.

Now, $12$ strikes will have $11$ intervals, which takes $11\times 2$, i.e. $22$ seconds.