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

Mathematics
JAMB 1981

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

  • A. 90o
  • B. 180o
  • C. 640o
  • D. 450o
  • E. 540o
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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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