Question

What fraction of clockwise revolution does the hour hand of clock turn through when it goes from $3$ to $9$.

• A. $\frac{1}{2}$
• B. $\frac{1}{3}$
• C. $\frac{1}{4}$
• D. $\frac{1}{5}$

Answer 1

The correct option is A

$\frac{1}{2}$

Hour hand turn $30°$ in one hour.

When it goes from $3$ to $9$. it turn $6$ hour.

Therefore total turn $=6x30=180°$

We know that, one complete revolution is $360°$.

So, $\frac{360°}{2}=180°$ is half of revolution.

Hence it will moves half of revolution.