Question

If a clock takes seven second to strike seven, how long will it take to strike ten ?

• A. $7$ seconds
• B. $9$ seconds
• C. $10$ seconds
• D. None of these

Answer 1

The correct option is D None of these

Given, clock takes seven second to strike seven.
Clearly, seven strikes of a clock have $6$ intervals while $10$ strikes have $9$ intervals.
Therefore, required time = $\frac{7}{6}\times 9=10\frac{1}{2}seconds$
Hence, option (D) is the correct answer.