Monday, June 27, 2011

Biking Dimensional Analysis

Given:
  • bike price  = 500 dollars
  • gas price = 3.50 dollars/gal
  • gas mileage = 19 miles/gal (source)
  • commute distance (round trip) = 10 miles
500 dollars * (1 gal/3.50 dollars) * (19 miles/1 gal) * (1 day/10 miles) = 271.4 days

Based on that, I need to ride my bike 272 days to pay for my bike.

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