How long is a distance of 8 km if measured on a map with a scale of 1:50,000

Since this is a ratios and proportions problem, you would set up the equation like this:

1/50,000 = x/8 x is the length of the distance on the map

After that, you cross multiply and you will get 50,000x=8

You then solve for x to get 0.00016