(related to Problem: Sir Edwyn De Tudor)
The distance must have been sixty miles. If Sir Edwyn left at noon and rode $15$ miles an hour, he would arrive at four o'clock — an hour too soon. If he rode $10$ miles an hour, he would arrive at six o'clock — an hour too late. But if he went at $12$ miles an hour, he would reach the castle of the wicked baron exactly at five o'clock — the time appointed.
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