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A railway clock has an inner 12-hour dial and an outer 24-hour ring. It shows a night departure. How is this time written on the 24-hour timetable?

Competition practiceClocks
  • A20:10
  • B22:10
  • C21:10
  • D09:10

Step-by-Step Solution

The hands show 9:10, and it is night, so the hour is read on the outer ring: 9 → 21. The time is 21:10. (09:10 is the morning time.)
Answer: C) 21:10

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