Respuesta :

3.1 miles (more accurately it is 3.107 miles)
Use the fact that 1 km  is approx. 0.625 mile.

Mult.    5 km by the conversion factor [0.625 mile / 1 km]:

5 km          0.625 mile
--------   *   ---------------- = 0.3 mile (to the nearest tenth mile)
    1                1 km