​How many kilometers are there in 1 mm? ​

Correct option is C

Given:

1mm

Solution:

We know that:

1 kilometer (km) = 1000 meters (m)

1 meter (m) = 1000 millimeters (mm)

Therefore:

1 mm = $$\frac{1}{1000}$$​ m

= $$\frac{1}{1000} \times \frac{1}{1000}$$​ km

= 0.000001 km

Option (c) is right.