What fraction of 1km is 550?

To find what fraction of 1 kilometer 550 meters is, you can express it as a fraction: ( \frac{550 \text{ meters}}{1000 \text{ meters}} ). This simplifies to ( \frac{55}{100} ) or ( \frac{11}{20} ). Therefore, 550 meters is ( \frac{11}{20} ) of 1 kilometer.