As stated 1 mile equals to 1.6 km,
so do calculation to get the 6 km
1 mile = 1.6 km
Then try to divide the 6 km with 1 mile value in km which is 1.6 km so that we know exactly how many miles required to get 6 km
So the answer is 3.75 miles
To prove this
If 1 mile = 1.6,
Then,
3 miles = (1.6 x 3 ) which produce 4.8 km
0.75 mile = ( 0.75 x 1.6 ) equals to 1.2 km
4.8km + 1.2km = 6km , which proves that
3 miles + 0.75 mile = 6km