Answer:
0.171 m
Step-by-step explanation:
First, let's determine how many mm of track he has in total...
74mm+97mm=171 mm
Now, we can set up a unit converter to convert mm to m (note that 1 mm is [tex]10^{-3{[/tex] m)...
[tex]171mm(\frac{10^{-3}m}{1mm})[/tex]
The "mm" cancels out...
[tex]171*10^{-3}m=0.171m[/tex]
