The following readings refer to a reciprocal leveling at staff stations A and B respectively:
| Instrument station | Staff reading (m) | Remarks |
|---|---|---|
| A | B | |
| P | 1.725 | 2.835 |
| Q | 0.835 | 1.545 |
The reduced level (RL) of staff station B in m is ______.
Min: 123 Max: 124.5
Answer: 123.75
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