The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

The reduced levels of the string at the consecutive sight rails A and

1.	The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
A.	1 in 100 upward
B.	1 in 500 upward
C.	1 in 100 downward
D.	1 in 503 upward
Answer» D. 1 in 503 upward