Puzzle #33: The mountain pass
7 December 2019
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From New Scientist #3259, 7th December 2019 [link] [link]
Aaron has spent the night camped at the foot of a mountain, while Bonnie camped at the summit. In the morning, Bonnie sets off down the path to base camp at exactly the same time as Aaron begins his ascent.
At midday they pass each other and nod a greeting, both of them maintaining their constant walking pace. Bonnie gets to the bottom at 4pm and sets up camp, but it isn’t until 9pm that Aaron finally reaches the top.
What time did the two hikers set off in the morning?