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A clock set right at 12 noon on 10 January 2027 gains 4 minutes every day. On which date will it next show the correct time at noon?

Competition practiceClocks
  • A8 July
  • B11 April
  • C9 July
  • D10 July

Step-by-Step Solution

It shows the right time again once it has gained 12 h = 720 min: 720 ÷ 4 = 180 days. 180 days after 10 January 2027 (not a leap year): 21 + 28 + 31 + 30 + 31 + 30 = 171 days to 30 June, and 9 more is 9 July. (11 April uses 90 days, a 6-hour gain; 10 July counts the first day twice.)
Answer: C) 9 July

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