The minute hand of a clock is 21 cm long. The distance moved by the trip of the misted hand in 1 hours is

21 π c m

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42 π c m

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10.5 π c m

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7 π c m

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Solution

The correct option is B $42 π c m$
The length of minute hand is $21 c m$
The distance covered by minute hand in $1$ hr is equal to its circumference
$i . e ., 2 π r = 2 π (21) = 42 π c m$

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