The time on a clock is 20 minutes past 7. What is the angle between the hands of the clock?  Select the correct option
A) 60 degrees	B) 100 degrees	C) 80 degrees	D) 50 degrees	E) 120 degrees
The hour hand rotates 360 degrees in twelve hours.   The hour hand rotates 30 degrees in one hour.   The hour hand rotates 5 degrees in ten minutes.   At this time, the hour hand has rotated 220 degrees.   The minute hand rotates 360 degrees in 60 minutes, or 60 degrees in ten minutes.   At this time, the minute hand has rotated 120 degrees.   The difference is 220 - 120= 
<gadget id="calculator">220 - 120</gadget>
<output>100</output>
100 degrees.   The answer is 100 degrees.
<result>B</result>
The time on a clock is 20 minutes past 7. What is the angle between the hands of the clock?