Choose those times at which the minute hand of a clock is perpendicular to the hour hand.

4:00

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9:00

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6:30

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3:30

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Solution

The correct option is B 9:00
At 9'o clock:
the hour hand is at 9 and the minute hand is at 12.
Hence, the angle between them is 90 degree and this implies the minute hand of a clock is perpendicular to the hour hand at 9:00.

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Choose those times at which the minute hand of a clock is perpendicular to the hour hand.

The correct option is B 9:00At 9'o clock: the hour hand is at 9 and the minute hand is at 12. Hence, the angle between them is 90 degree and this implies the minute hand of a clock is perpendicular to the hour hand at 9:00.

The correct option is B 9:00
At 9'o clock:
the hour hand is at 9 and the minute hand is at 12.
Hence, the angle between them is 90 degree and this implies the minute hand of a clock is perpendicular to the hour hand at 9:00.