A clock loses 5 seconds in every 24 minutes. At 10:00PM on Monday, it is 19 minutes fast. When will it be at the right time?
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The clock hands-turning rate ω is 5 seconds in 2 4 minutes or ω = 2 4 × 6 0 2 4 × 6 0 − 5 = 1 4 4 0 1 4 3 5 . Let the time lapse after Monday 10:00 PM be t , then we have:
t ⇒ 1 4 4 0 5 t t = ω t + 1 9 × 6 0 = 1 4 4 0 1 4 3 5 t + 1 1 4 0 = 1 1 4 0 = 3 2 8 3 2 0 s ÷ 6 0 s = 5 4 7 2 min ÷ 6 0 min = 91 hr 12 min 9 1 ÷ 2 4 hr = 3 days 19 hr 12 min
⇒ 0 : 2 2 : 0 0 + 3 : 1 9 : 1 2 = 3 : 4 1 : 1 2 = 4 : 1 7 : 1 2 = Friday 5:12 PM