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分享 Dollar cost averaging ......
1969-12-31 07:00 PM
v1=v0-dv, t1=(s/2)/v1 v2=v0+dv, t2=(s/2)/v2 (v1+v2)/2.0=v0, t1+t2=(s/2)(1/v1+1/v2) =(s/2)(2v0/ ) =s/ .gt. s/v0 The time lost in a traffic jam cannot be made up easily by speeding in the rest of the journey though the average speed remains the same.
个人分类: watering|521 次阅读|0 个评论

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