On a straight railway track, absolute levels at point A on two rails are 100.550 m and 100.530 m and the absolute levels at point B 100 m apart are 100.585 m and 100.515 m respectively, the value of twist of rails per metre run, is

On a straight railway track, absolute levels at point A on two rails a

1.	On a straight railway track, absolute levels at point A on two rails are 100.550 m and 100.530 m and the absolute levels at point B 100 m apart are 100.585 m and 100.515 m respectively, the value of twist of rails per metre run, is
A.	0.4 mm
B.	0.5 mm
C.	0.7 mm
D.	0.8 mm
Answer» C. 0.7 mm