certain rail sections of 8 meters length was changed to 12 meters. How much you will need of 12 meters length rails if there were 360 old rails been removed
There were 360 rails of 8 meters length removed, all in all 360*8 = 2880 meters of removed rail sections. 2880/12 = 240 rails sections of 12 meters length each you need to place instead of old ones.
+259 
