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Q.

How much time takes hour hand to rotate 180°?

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a

30 min

b

1 hr

c

45 min

d

6 hrs

answer is D.

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Detailed Solution

Hour - hand

$\begin{array}{l} 1 h o u r \to 30 ° \\ x hour \to 180 ° \\ \frac{180 \times 1}{30} = x \\ x = 6 h r s \end{array}$

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