If D is the distance between parallel tracks G is the gauge and α is angle of crossings, the distance between theoretical noses of two crossings measured parallel to tracks, is

If D is the distance between parallel tracks G is the gauge and α is

1.	If D is the distance between parallel tracks G is the gauge and α is angle of crossings, the distance between theoretical noses of two crossings measured parallel to tracks, is
A.	(D - G - G sec α) cot α
B.	(D - G + G sec α) cot α
C.	(D - G - G sec α) tan α
D.	(D + G + G sec α) cot α
Answer» B. (D - G + G sec α) cot α