For your brain… I guess

Standard
You may not find it challenging at all!
 
Say a plane departs from point A with a destination of point B, 200 miles away. Halfway there, the pilot finds that he is one mile off course. He makes a correction and flies directly to point B. How much extra distance did he fly by being off course?
 
A) 1/100 of a mile
B) one mile
C) two miles
D) 20 miles
 
The answer is1/100 of a mile. The pilot had flown about 100.005 miles (the square root of 100 squared + 1 squared) at the halfway point. So he had flown 200.01 miles by the time he got to the destination.
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