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Un article trouvé pour ce sujet.
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Average speed up and down a hill |
2008-03-09 |
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Judith pose la question :
An old broken-down ar has to travel a two miles route, up and down a hill.
Because it is so old, the car travels the first mile - the ascent - at an average
speed of fifteen miles per hour. How fast must it cover the second mile -
the decent - to achieve an average speed of thirty miles per hours?
(There is a missing variable, but what is it?)
Penny Nom lui répond. |
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