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How many times from 4 pm to 10 pm, the hands of the clock are at right angles?

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Important Questions on Calendar and Clock

EASY
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How many times from 8 am to 8 pm the hands will be in opposite directions?
HARD
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Two watches, one of which gained at the rate of 1 min , and the other lost at the rate of 1 min daily, were set correctly at noon on the first January 1988. When will the watches indicate the same time?
MEDIUM
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If March 17, 1980 falls on Monday. On what day would July 13th 1980 fall?