599. 60 м 45 мм - 180 мм

To solve this problem, we need to subtract the lengths given. First, we subtract the millimeters: 45 mm - 180 mm. Since we cannot subtract 180 from 45, we borrow 1 meter (which is 1000 mm) from 60 m. Now we have 60 m - 1 m = 59 m, and 45 mm + 1000 mm = 1045 mm. Then, we subtract the millimeters: 1045 mm - 180 mm = 865 mm. The meters remain 59 m. The total length is 59 m and 865 mm. Since 865 mm is equal to 0 m and 865 mm, the result is 59 m and 865 mm. Or, if we convert 865 mm to meters and millimeters: 865 mm = 0 m and 865 mm. The answer is 59 m and 865 mm.