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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