Henry Ernest Dudeney/Modern Puzzles/45 - The Man and the Dog
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Modern Puzzles by Henry Ernest Dudeney: $45$
- The Man and the Dog
- "Yes, when I take my dog for a walk," said a mathematical friend, "he frequently supplies me with some interesting problem to solve.
- One day, for example, he waited, as I left the door, to see which way I should go,
- and when I started he raced to the end of the road, immediately returning to me;
- again racing to the end of the road and again returning.
- He did this four times in all, at a uniform speed,
- then ran at my side the remaining distance, which according to my paces measured $27$ yards.
- I afterwards measured the distance from my door to the end of the road and found it to be $625$ feet.
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Sources
- 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Arithmetical and Algebraical Problems: Locomotion and Speed Puzzles: $45$. -- The Man and the Dog
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Speed & Distance Puzzles: $73$. The Man and the Dog