If D is distance between centres of two parallel tracks of gauge G with entire curved leads and equal angles of crossing, total length of crossover, is

If D is distance between centres of two parallel tracks of gauge G wi

1.	If D is distance between centres of two parallel tracks of gauge G with entire curved leads and equal angles of crossing, total length of crossover, is
A.	d (4r - 2g - d)]
B.	d (3r - 2g -d)]
C.	d (3r + 2g - d)]
D.	d (4 + 2g - d)]
Answer» B. d (3r - 2g -d)]