Answer:
Step-by-step explanation:
If the new height is 338m and the helicopter decended 127m to get to that new height then the original height is simply the sum of them both.
H = 338m + 127m
H = 465m
420 miles because if you multiply 60 minutes times 4 hours you get 240 miles then multiply 60 times 3 add your two answers together....