Take up running! You'll live longer!

Classical Mechanics Level pending

You jog at exactly \(3.2\) kilometers per hour (as clocked by a stationary observer). Say that you run \(10\) kilometers every day for \(80\) years (a Julian year is exactly \(365.25\) days). According to special relativity, how much younger in seconds due to running will you be than your twin (who was born at exactly the same time as you, but sat stationary on a couch the whole time)?

Round to two decimal digits (and pay attention to formatting your answer in scientific notation).

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