First convert 5.2 km to feet
5.2km = 17060.4 feet
Now, multiply.
5.2 · 17060.4 = 88714.08
88714.08 feet
27.040051584 km
First you have to select 1 of those units of measure, so:
in terms of km:
5280 feet = 1.6km
5.2 x 1.6 = 8.32km
in terms of feets:
5.2km = 17060.4 feet
17060.4x5280= 90078912 feet