If you mean in Roman numerals then in today's modern notation of Roman numerals it is now 3475 = MMMCDLXXV but the ancient Romans probably notated them quite differently.
Symbols are written and read from left to right, from highest to lowest.'3475' look like in Roman numerals MMMCDLXXV. MMMCDLXXV = 3475
1740/3475 = 0.500719424460432 So, 1740 is approximately 50.07% of 3475.
18 in roman numerals looks like XVIII
The Roman numerals are XLV.
5648 = 9123 - 3475
Answer: 3475 km = 2,159.264 mi.
300 would be represented by 'CCC' in roman numerals.
MCMLXXXIX
DCLXVI
VII
MCMLII
XXI