Answer:
6 min
Step-by-step explanation:
5 kilometers = 5,000 meters
500/5,000 = 1/10 meaning it would take him 1/10 of an hour or 6 minutes to cover this distance.
The wings of the butterfly would be 67 millimeters
Idk if you want a specific number but here's an example.
Some ways you can write a number are as a decimal, as a percentage, and as a decimal.
5 as a fraction is

5 as a percent is 5%
5 as a decimal is .20