The distance that Harold swim in 5 hours should be 16 km.
Given that,
Here we assume the distance be x
So,
[tex]6\frac{2}{5}[/tex] =6.4
Now
[tex]\frac{6.4}{2}=\frac{X}{5}[/tex]
2x=(6.4)(5)
2x=32
Now Divide by 2 on both sides
Thus,
X=16 km
Therefore, we can conclude that the distance that Harold swim in 5 hours should be 16 km.
Learn more about the distance here: brainly.com/question/12319416