Since a clock hand turns 360 degrees in 60 minutes, it will move 30 degrees in 5 minutes and 120 degrees in 20 minutes.
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It is 90 degrees
There are 360 degrees on the clock face that the minute hand travels in one hour which is 6 x 10 minutes. So the degrees turned by the minute hand in 10 minutes is 360/6 = 60
Which hand? The minute hand moves 360 degrees in 60 minutes which is 6 degrees per minute. So in 37 minutes it moves 37*6 = 222 degrees.
In 60 minutes, the minute hand completely circumnavigates the face of the clock,and returns to where it was 60 minutes earlier. That's a travel of 360 degrees.
12 minutes is 1/5th of an hour. The minute hand sweeps 360 degrees - a full circle - in one hour. So the angle formed by the start and stop of a 12-minute sweep of the minute hand would be 1/5th of 360 degrees or 72 degrees.