Question 524213
The plane has taken a rectangular path

300 North
Turn right to east 400 
then down south 500

it is 200 miles more south than the starting point

the horizontal distance is 400 km

Apply Pythagoras theorem

400^2+200^2= distance ^2

160000+40000=d^2
 200000= d^2
d= sqrt (400000)
d= 447.2  km from starting point