As an applied physics engineer, I passed through such problems a lot. I have well-reputable assumptions claiming that 0.08 grams of tread are per kilometer, so basically this is the only hint needed
Relevant Skills and Experience
I think I helped you solve this question :P, anyway if still you can't solve it just chat with me and I will help you, I have got the answer already :D
Proposed Milestones
$25 USD - kkd