An aircraft flies 5900 km per day around Earth at 210 m/s. The aircraft returns to its starting point 4 days later at the same speed. How much has the pilot aged compared to their airbase colleagues? Hint: Use the binomial approximation.

• A. 59 ns more than their colleagues
• B. 49 ns less than their colleagues
• C. 28 ns less than their colleagues
• D. 99 ns more than their colleagues

Answer: (C)