Yes, both a & b are correct. One furlong is equal to 40 rods and 110 fathoms. So a Kentucky derby distance of 10 furlongs is equal to 400 rods and 1100 fathoms.So if you have a Kentucky derby distance of 10 furlongs, then to convert it to rods and fathoms, multiply it by 40 and 110, respectively. It is equal to 400 rods and 1100 fathoms.
