Bunuel wrote:
De Bruyne and Mbappe start racing from the bottom of a 100-meter hill to the top and then back to the bottom by the same route. Each of them runs up at his constant rate and back down with twice that constant rate. What would be the distance between the two, when the fastest one finishes the entire 200-meter race ?
(1) Mbappe and De Bruyne cross each other when Mbappe has run 140 meters.
(2) Mbappe reaches the top of the hill 10 seconds before De Bruynedoes.
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(1) Mbappe and De Bruyne cross
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