Speed of Minute Hand
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Theorem
Consider an analogue clock $C$.
The minute hand of $C$ rotates at $6$ degrees per minute.
Proof
It takes one hour, that is $60$ minutes, for the minute hand to go round the dial one time.
That is, in $60$ minutes the minute hand travels $360 \degrees$.
So in $1$ minute, the minute hand travels $\dfrac {360} {60} \degrees$, that is, $6 \degrees$.
$\blacksquare$