A survey line XY is measured along a steep gradient of 8° by two survey teams A and B. Team A used a 30m Fibron tape which when checked was found to have shrunk by 50mm. The measured length was 85.24m. Team B used a 20m steel tape which was actually 20mm too long. The measured length was 84.94m. Calculate the most probable horizontal corrected length XY. (85.098m, 85.025m)
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