The clock shows 12 hours. After how many minutes will the angle be between the hour and minute hand 90°?

Consider the continuous movement of both hands for hours.

Correct answer:

x =  16.36 min

Step-by-step explanation:

360/60·x - 360/(12·60)·x = 90

330x = 5400

x = 5400/330 = 16.36363636

x = 180/11 ≈ 16.363636

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