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A wall clock showed the correct time at 12 noon on Sunday (clock A). At 12 noon on Monday it read as on clock B. It gains at a steady rate. On which day of the week will it first be a full hour fast at noon?

Competition practiceClocks
  • ASunday
  • BWednesday
  • CTuesday
  • DThursday

Step-by-Step Solution

Clock B shows 12:06, so it gains 6 min a day. A full hour needs days: Sunday + 10 days = Wednesday of the following week. (Tuesday counts 9 days.)
Answer: B) Wednesday

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