How many times are an hour hand and a minute hand of a clock at right angles during their motion from 1.00 p.m. to 10.

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Q 2452545434.     How many times are an hour hand and a minute hand
of a clock at right angles during their motion from
1.00 p.m. to 10.00 p.m.?
IAS 2009 Prelims
A

`9`

B

`10`

C

`18`

D

`20`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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