How many times are the hands of a clock at right angles in a day?
Explanation:
Hands of a clock are perpendicular twice every hour except between 2 - 4 O’clock and 8 – 10 O’clock when they are perpendicular thrice in there 2 hours.
∴ In 12 hours they are at right angles 22 times (because two positions 3 O'clock and 9 O'clock are common)
∴ In a day they are at right angle 44 times.
Hence, option (d).
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