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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Analytical Reasoning
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Q)

Find the number of right angles turned through by the hour hand of a clock when it goes from 1 to 10.

$(A) \; 2 \\(B)\;3 \\(C)\; 1 \\(D)\;more\;than\;3 $

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A)
Solution :
When the hour hand of the clock goes from 1 to 10 it rotates by 3 right angle (ie) 270
Angle formed between $12 \;to\;1= 30^{\circ}$
$1 \;to \;10= 30 \times 9$
$\qquad= 270^{\circ}$
$\therefore$ 3 right angle
Answer : 3
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