题目
问一道关于GMAT数学上的相遇问题
Steve gets on the elevator at the 11th floor of a building and rides up at a rate of 57 floors per minute.At the same time Joyce gets on an elevator on the 51st floor of the same building and rides down at a rate of 63 floors per minute.If they continue traveling at these rates,at which floor will their paths cross?
Steve gets on the elevator at the 11th floor of a building and rides up at a rate of 57 floors per minute.At the same time Joyce gets on an elevator on the 51st floor of the same building and rides down at a rate of 63 floors per minute.If they continue traveling at these rates,at which floor will their paths cross?
提问时间：2021-04-01
答案
Assume in t minutes their paths cross,then
11+57t=51-63t,t=1/3 so 11+57*(1/3)=30th floor
11+57t=51-63t,t=1/3 so 11+57*(1/3)=30th floor
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