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Below is the complete solution : -
two points on earth are : (39N,120W) and (41N,84W) midpoint between them = <span>(<span><span>39+41/</span>2</span>N, <span><span>120+84/</span>2</span>W) = </span>(802N, 104/2W) = <span>(40N,52W<span>)</span></span>