After bottoming out: x=(lg 1000)/(lg2.5), y=(lg 1000)/(lg0.25)
1/x- 1/y =(LG 2.5)/(LG 1000)-(LG 0.25)/(LG 1000)=[(LG 2.5)-(LG 0.25)]/(LG 1000)
=[LG(2.5/0.25)]/(LG 1000)=(LG 10)/(LG 1000)= 1/3
choose one
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