Please reason step by step, and put your final answer within \boxed{}.
A merchant ship sailing in the Somali waters discovered a pirate ship 50 nautical miles in the direction 60 degrees north of west. The merchant ship then called for help from an escort ship located 50 nautical miles in the direction 60 degrees south of west. At this moment, the escort ship is exactly in the (fill in east, west, south, north) direction of the pirate ship and how many nautical miles away?
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