The elevation of the top of the hill is 238 1/2 yd, while the elevation of the valley floor is -63 1/2 yd (compared to the sea level). The elevation at which Harry stopped for lunch is the mean of the two:
(238 1/2 - 63 1/2) / 2 = 175/2 = 87 1/2 yards above the sea level.
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