Can someone help me please I will mark brainless

Answer:
I think your answer will be C) 10km/hr
Explanation:
what i did was:
[tex]7 \div 0.7 = 10[/tex]
then when I put
[tex]0.7 \div 7[/tex]
It was 0.1 but you want to know how fast he was walking and when someone walks 0.1km/hr their really walking slow.