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M: +1.00/-0.25

In the leveling between two points A and B on the opposite sides of a pond, the level is first set up near the point A and staff reading on A and B are2.5 m and 2.0 m respectively. Then the level is moved and set near the point B, staff reading on points A and B are 1.2 m and 1.7 m respectively. Calculate the difference of heights between the two points A and B (in metre).

[SSC JE Civil 2017-18 (22 Jan Tech 1)]
A
B
C
D