简答题:已知汽车行驶时每小时的耗油费用y(元)与行驶速度x(公里/小时)的关系为y=,若汽车行驶时除耗油外的其他费用为每小时10

题目内容:
已知汽车行驶时每小时的耗油费用y(元)与行驶速度x(公里/小时)的关系为y=,若汽车行驶时除耗油外的其他费用为每小时100元,求最经济的行驶速度.
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