Henry Ernest Dudeney/Puzzles and Curious Problems/62 - At Right Angles
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Puzzles and Curious Problems by Henry Ernest Dudeney: $62$
- At Right Angles
- How soon between the hours of five and six will the hour and minute hands of a clock be exactly at right angles?
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Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Clock Puzzles: $62$. -- At Right Angles
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Clock Puzzles: $54$. At Right Angles