Making Maths Count

Maths Week Scotland – Poor Timekeeping

September 16, 2018 by 2 Comments

It’s the final day of Maths Week Scotland 2018 and here is the final puzzle. I hope you’ve enjoyed the puzzles – I think they’ve been a lot of fun. Good luck with the final puzzle! The solution to this and all of the week’s problems will be published by 5pm.

Poor Timekeeping

In cleaning out a drawer, Daniel found two old watches which he and his wife had discarded. He wound them up, and after setting them accurately, started both watches at the same time. An hour later he noticed that his old watch had gained a minute whilst his wife’s watch had lost two minutes. In fact his watch was running consistently fast and his wife’s watch was running consistently slow. Next morning, when he looked at the watches again, it was 7.20 on his old watch and 6.20 on his wife’s. What time was it when he started the watches running?


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