问题标题:
问一道关于GMAT数学上的相遇问题Stevegetsontheelevatoratthe11thfloorofabuildingandridesupatarateof57floorsperminute.AtthesametimeJoycegetsonanelevatoronthe51stfloorofthesamebuildingandridesdownata
问题描述:

问一道关于GMAT数学上的相遇问题

Stevegetsontheelevatoratthe11thfloorofabuildingandridesupatarateof57floorsperminute.AtthesametimeJoycegetsonanelevatoronthe51stfloorofthesamebuildingandridesdownatarateof63floorsperminute.Iftheycontinuetravelingattheserates,atwhichfloorwilltheirpathscross?

汪文元回答:
  Assumeintminutestheirpathscross,then   11+57t=51-63t,t=1/3so11+57*(1/3)=30thfloor
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