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Each hour has 60 minutes, so we need to compute 5/12 of 60 min which is 
<h2>Answer:</h2><h2></h2><h3>21m</h3><h2></h2><h2>Explanation:</h2><h2></h2>
The diagram and complete question is shown below. We know that the length (L) of the living scale in the drawing is:
We also know that the scale is:
Then, by using proportion we have: