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A wall clock gains the same whole number of minutes every day. It was set right on 1 June; the picture shows what it reads three days later. After how many days from 1 June will it next show the correct time?

Competition practiceClocks
  • A144 days
  • B288 days
  • C141 days
  • D48 days

Step-by-Step Solution

In 3 days it has gained 15 min (it shows 8:15 at 8:00), i.e. 5 min a day. A 12-hour face shows the right time again after gaining min: days. (288 days uses 24 hours.)
Answer: A) 144 days

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