Question 711105
Just like stated in the problem...cm=km. Plug the numbers in, keeping the cm in the same place on both sides of the equations whether it be the numerator or denominator. Your preference.

5cm/5km = 'x'cm/5.6km
Cross Multiply
5x=28
Divide both sides by 5 to get x alone
x=5.6

Make sure to include your units of measure in your solution "5.6cm"

To check your work, plug the solution for x back into the original equation and work it through.