In the area covered by the contour map above, six men standing various places. Which of the men at J, K, L, M and N will NOT be able to see the man at X? (A...

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In the area covered by the contour map above, six men standing various places. Which of the men at J, K, L, M and N will NOT be able to see the man at X? (Assume that there is no vegetable cover; contours are in metres). The man is at