How long would it take to walk 3.2 km at 3 km per hour

It is obviously one hour+ so:

3/0.2=15

60 minutes/15=4 minutes

One hour & four minutes!

How long would it take to walk 3.2 km at 3 km per hour (?)   It would take 1hr  and  4 min. 

You can use the units to help you

 

$$\\\not{km}\times \frac{hours}{\not{km}}=hours\\
so\\
\not{km}\div \frac{\not{km}}{hours}=hours\\
so\\
3.3\not{km}\div \frac{3\not{km}}{hours}=3.2\div 3 hours\\
that's\\
1.0\bar6\;\;hours \\
and\\
0.0\bar6\;\;hour=0.1\times 60 =4\;\;minutes\\
$So that is$ \\
$1 hour and 4 minutes$$$