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A clinic's waiting-room clock is 10 minutes fast. Dr Rao starts seeing patients at 4:00 sharp. By the clock, it is now the time shown. How long must a patient really wait?

Competition practiceClocks
  • A45 min
  • B35 min
  • C25 min
  • D15 min

Step-by-Step Solution

The clock shows 3:35, but it is 10 min fast, so the real time is 3:25. From 3:25 to 4:00 is 35 min. (25 min trusts the clock; 15 min adjusts the wrong way.)
Answer: B) 35 min

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