The best way is to check with the Delta Sky Miles program itself. USA Today, also has a guide in their Travel Tips section with links to guides and charts.
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$19.44
To calculate Delta t, you would subtract Universal Time or UT from Terrestrial Time or TT. Delta t would be the difference.
You would spend about $2,400 per year if you drive an average 15,000 miles per year at 25 mpg and the price of gas at $4 dollars a gallon.
You would still have travelled 42 miles but 42/0.6 is equivalent to 70 kilometers,
I would give it to somebody who is living on the street