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In one and a half hours, the minute hand of a clock rotates through an angle of

In one and a half hours, the minute hand of a clock rotates through an angle of
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  • A 90o
  • B 180o
  • C 640o
  • D 450o
  • E 540o
Correct Answer: Option E
Explanation:
1 hr, = 60 mins, 60 mins = 360o
30 mins = \(\frac{360^o}{1}\) c \(\frac{30}{60}\)
= 180o
90 mins = 360 + 180o
= 540o

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