A seismograph records the epicenter of an earthquake 50 miles away. A second seismograph. 10 miles west and 40 miles south of the first, records the epicenter as being 40 miles away. A third seismograph, 30 miles east of the frst and 60 miles south, records the epicenter 20 miles away. Where was the earthquake's epicenter in relation to the frst seismograph?

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