railway RRB JE (CBT I + CBT II) Mock Test 2024 Surveying Compass Surveying and Theodolite

In a compass survey, if the observed for bearing of line PQ at station P is 200° 30', then back bearing of the line at station Q is:

1
110° 30'
2
20° 30'
3
159° 30'
4
69° 30'
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