Suppose a rescue helicopter 700 feet above sea level descends 400 feet to search for debris or any other signs of a submarine in trouble. When the captain does not see anything, he ascends 200 feet and stays at that altitude while he tries to get a radio signal from the submarine. A few moments later he speaks to the captain and
is informed that the submarine is 122 feet below sea level. How far is the helicopter from the submarine ?
The helicopter is feet away from the submarine.
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