What is the longest length: one yard, one kilometer, one meter, or one inch

Answer 1

One kilometer is the longest length among the options provided. The conversions for reference are as follows:

• 1 yard = 0.9144 meters
• 1 kilometer = 1000 meters
• 1 meter = 39.37 inches
• 1 inch = 0.0254 meters

Therefore, in order from longest to shortest: one kilometer, one meter, one yard, and one inch.