Question

If a clock takes seven seconds 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

Clearly, seven strikes of a clock have $6$ intervals while $10$ strikes have $9$ intervals.
$\therefore$ Required time $=(\frac{7}{6}\times 9)$ seconds $=10\frac{1}{2}$ seconds.