Answer:
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Fractions: 1 Mark each
We may observe that in one complete clockwise revolution, the hour hand will rotate through${360}^{\circ }$
a) We have to find out the fraction of a clockwiserevolution that an hour hand turns through when it rotates from 3 to 6.
Now, when the hour hand rotates from 3 to 6 it will rotate through 1 right angle.
$\therefore$ The fraction of revolution =$\frac{{90}^{\circ }}{{360}^{\circ }}$$=$$\frac{1}{4}$ revolution
b) Here the hour hand rotates from 6 to 12, which is to right angles.
$\therefore$ The fraction of revolution =$\frac{{180}^{\circ }}{{360}^{\circ }}$$=$$\frac{1}{2}$ revolution