Answer
$ 120^{\circ}$
Work Step by Step
Hour hand completes one rotation in 12 hours, thus rotates through $360^{\circ}$-
i.e. degrees swept in 12 hours = $360^{\circ}$
Therefore degrees swept in 1 hour = $\frac{360}{12} $ = $ 30^{\circ}$
So degrees swept in 4 hours = $4 \times 30^{\circ}$ = $ 120^{\circ}$
