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11) What will be the angle between the hands of clock at 7 : 10?
Explanation :
angle traced by hour hand per minute = (1/2)°
∴ angled traced by hour hand in 8 h 30 min =[(8×60)+30x1/2]°
= [480+30×1/2]o°= 510 × (1/2)° = 255°
∴ Angle traced by minute hand per minute = 6°
∴ Angle traced by minute hand in 30 min = 30 × 6° = 180°
∴ required angle = (255° - 180°) = 75°