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A town-hall clock has a 21 cm minute hand. How far does the tip of that hand move between the times on clocks A and B? (Use π = 22/7.)

Competition practiceClocks
  • A44 cm
  • B132 cm
  • C22 cm
  • D66 cm

Step-by-Step Solution

A shows 6:05 and B shows 6:25: 20 minutes, one-third of a turn. Full circumference = cm, so the tip moves 132 ÷ 3 = 44 cm. (132 cm is a full turn; 66 cm is half a turn.)
Answer: A) 44 cm

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