The "Back sight" reading on a vertically held staff at a point on the floor along the centre line of a railway tunnel is 3.465 m, and the "Fore sight" on the inverted staff held at the roof of the tunnel just vertically above is 1.115 m. The height of the tunnel along the centre line at floor point is

The "Back sight" reading on a vertically held staff at a point on the

1.	The "Back sight" reading on a vertically held staff at a point on the floor along the centre line of a railway tunnel is 3.465 m, and the "Fore sight" on the inverted staff held at the roof of the tunnel just vertically above is 1.115 m. The height of the tunnel along the centre line at floor point is
A.	2.310 m
B.	3.465 m
C.	4.620 m
D.	6.930 m
Answer» D. 6.930 m

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