Q. If D is distance between centres of two parallel tracks of gauge G with entire curved leads andequal angles of crossing, total length of crossover, is (Solved)
1. d (4r - 2g - d)]
2. d (3r - 2g -d)]
3. d (3r + 2g - d)]
4. d (4 + 2g - d)]
- a. d (4r - 2g - d)]