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Answer with Explanation:
Angle traced by hour hand in 21/4 hrs
= (360 / 12 x 21 / 4 )º = 157 1/2 º
Angle traced by min. hand in 15 min
= (360/60 x 15)º = 90º.
Required angle = ( 157 1/2 )º - 90º = 67 1/2 º.
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