Q.

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» A. D (4R - 2G - D)]
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