RRB Group D Model Paper 10 with solutions

(3) 3 hours 20 minutes means $3\frac{1}{3}=\frac{10}{3}$ hours.
Angle traced in $\frac{10}{3}$ hours by hour hand = $\frac{360}{12}\times \frac{10}{3}$ = 100°
Angle traced in 20 minutes by minute hand = $\frac{360}{60}$ x 20 = 120°
So, Angle between hour and minute hand is 120° - 100° = 20°