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A hostel warden's night duty starts at the time on clock A (night) and ends at the time on clock B (next morning). How long is the duty?

Competition practiceClocks
  • A4 h 15 min
  • B8 h 15 min
  • C7 h 15 min
  • D7 h 45 min

Step-by-Step Solution

A shows 10:20 p.m. and B shows 6:05 a.m. 10:20 p.m. to midnight is 1 h 40 min; midnight to 6:05 a.m. is 6 h 5 min. Total 7 h 45 min. (4 h 15 min subtracts 6:05 from 10:20 on the dial.)
Answer: D) 7 h 45 min

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