If the standard length of a crossing is 480 cm, the number of crossing

1.	If the standard length of a crossing is 480 cm, the number of crossing is
A.	1 in of B.G.
B.	1 in of M.G.
C.	both (a) and (b)
D.	none of these.
Answer» D. none of these.

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If the standard length of a crossing is 480 cm, the number of crossing is

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