A clock is 3 minutes fast at 11:30 AM and 9 minutes fast at 11:30 PM. At what time (in AM) will it show the correct time?
Show answer & explanation
Correct answer: B
Explanation
In 12 hours, clock goes from 3 to 9 minutes fast ⇒ total 6 minutes ⇒ 0.5 minute per hour
Correct time occurs when error becomes 0 ⇒ time to lose 3 minutes = 3 ÷ 0.5 = 6 hours
11:30 AM − 6 hours = 5:30 AM
Correct Answer: 5:30