You Have the Responsibility of Designing a Railroad Track Crossing

You have the responsibility of designing a railroad track crossing for an outside plant OSP cable. There are three separate railroad tracks to be crossed. The measurement between the center of the two outer tracks is 16 m (52 ft) . Using the standard track width of 1435 mm (4 ft 8.5 in) , what is the length of the rigid steel conduit required to facilitate the crossing?

A) 20 m (66 ft)
B) 25 m (82 ft)
C) 31 m (102 ft)
D) 35 m (115 ft)
E) 40 m (130 ft)