At 3:40, the hour hand and the minute hand of a clock form an angle of:
120°
125°
130°
140°
135°
Formula to calculate angle = (11m/2) - 30h
Where, m = minute & h = hour
So, Angle when the time is 3:40 = (11 x 40/2) - 30 x 3
= 220 - 90 => 130 degree