The angle between the minute hand and the hour hand of a clock when the time is 7:20a.m. is
A
120∘
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B
75∘
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C
90∘
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D
100∘
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Solution
The correct option is D100∘ 7 hr 20min=7+2060=223 hr Angle traced by hour hand in 7 hr 20min=(223×36012)∘=220∘ Angle traced by the minute hand in 20min=(36060×20)∘=120∘
Hence, required angle between the two hands =220∘−120∘=100∘