Question

2. How many times the hand of a clock are at
right angle in a day?
(a) 24
(b) 48 (c) 22 (d) 44
3. How many times in 24 h the hands of a
clock are in straight line but in opposite
directions?
(a) 20 (b) 22 (c) 24. (d) 48
4. How many times in 24 h the hands of a
clock are straight?
(b) 44
(c) 24
(d) 22
(a) 48

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Answer 1

Answer:

: In 12 hours, they are at right angles 22 times. In 24 hours, they are at right angles 44 times.

Explanation:

:

If you switch to a rotating coordinate system in which the hour hand stands still, then the minute hand makes only 11 revolutions, and so it is at right angles with the hour hand 22 times. In a 24 hour day you get 2×22=44.