Here are two ways of doing this.
Method A
160 km is 100%
Since you want to increase by 30%, yo want 130% of 160 km.
130% of 160 km = 130% * 160 km = 1.3 * 160 km = 208 km
Method B
You need to add 30% of 160 km to 160 km.
First, we find 30% of 160 km.
30% of 160 km = 30% * 160 km = 0.30 * 160 km = 48 km
Now add the 305 to the original amount.
160 km + 48 km = 208 km
