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company A= $90+0.60 per mile

company B=40+0.8 per mie

let get x as the miles must be driven A to have better deal

then

for x miles

the total cost of company A lower than company B

90+0.6x<40+0.8x

simplify

90-40<0.8x-0.6x

50<0.2x

50/0.2<x

250<x

so the truck must be driven more than 250 miles

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