Gurujobalert

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.?

a

  9

b

 10

c

 18

d

 20

e

 None of these

Answer : Option C
Explanation :
In one hour, hour hand and minute hand are at right angles 2 times.
Time = 10 p.m - 1 p.m = 9 hr.
No. of times, when both hands are perpendicular to each other in 9 hr = 9 $\times$ 2 = 18
500
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