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Sunday Times Teaser 3111 – Don’t Miss a Second

by Brian Gladman on May 7, 2022

by Howard Williams

Published Sunday May 08 2022 (link)

I have an analogue wall clock with a second hand and also a separate 24-hour hh:mm:ss digital clock. The wall clock loses a whole number of seconds over a two-digit period of seconds. The digital clock gains at a rate 2½% greater than the wall clock loses. After resetting both clocks to the correct time, I noticed that they both displayed the same but wrong time later in the same week, and one hour earlier than the time of setting.

I can reset one of the clocks at an exact hour so that it will show the correct time when the televised rugby kicks off at 19:15:00 on the 31st.

What is the latest time (hour and date) when I can do this?

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3 Comments Leave one →
  1. Brian Gladman permalink

  2. John Z. permalink

    Using ‘Fraction’ was probably overkill but I was worried that floating point rounding might affect the result.

  3. Erling Torkildsen permalink

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