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प्रश्न
Choose the most appropriate option for the following question.
How many times from 4 pm to 10 pm, the hands of a clock are at right angles?
विकल्प
6
10
9
11
उत्तर
11
Explanation:
Every hour the hands of a clock are at right angles twice i.e. in 6 hours (4 to 10) they would be right angles to each other 12 times. However, since 3'Oclock is the common time in time range 2 to 3 and 3 to 4, thus we substract this once due to repetition in counting. Thus, from 4 pm to 10 pm the two hands of a clock will be perpendicular to each other 11 times.
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