Travel time through the ages

Your user enters a distance, in kilometers or in miles, and the section answers with five durations: on foot, on horseback, by carriage, under sail and by car. Each line carries its reference pace and the time computed, in days, hours and minutes. All five recalculate at every keystroke, with no button to press. Over a hundred kilometers, that gives twenty hours of walking, two and a half days on horseback, thirteen hours of sailing, and a little over an hour by car.

The figures hold up. Switching to miles does not just change the label, it converts the distance and recalculates the five lines. A distance of zero or below shows no result: the section says so and leaves five dashes, rather than a wrong figure. And a journey too short to take a minute is shown as such, instead of zero.

A historic site, a museum, a tourist office, a hiking app: wherever a road has a history, distance stops being a number. Twenty kilometers means nothing to anyone. Four hours of walking does.

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  No distance to plan for, the section computes them all
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  Switching to miles recalculates everything, not just the label
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  The “that took a while back then” becomes a figure