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JAMB Mathematics 1981 Question 13

Question 13

Angles and Polygons

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

  1. A.90°
  2. B.180°
  3. C.640°
  4. D.450°
  5. E.540°
Show the answer and explanation

Answer: E (540°)

Explanation

The minute hand turns 360° every hour, so in 1½ hours it turns 1.5 × 360° = 540°.