Answer
224 Km
4 Km
Explanation
Part 1
The plane flies 100 Km north and then 200 Km east. This makes a 90° turn. To get the distance taken by the plane we get the hypotenuse.
c² = a² + b²
c² = 100² + 200²
= 50,000
c = √50,000
= 223.606 Km
The answer to the nearest whole number is 224 Km
Part 2
If the runner run 15 Km north then 11 Km south, the resultant distance would be,
15 - 11 = 4 Km