When I did the math in my head the fraction I got was 20/100000. 20/100000 as a decimal form is 0.0002.
Which question do you need help with
we are given

we can find x , y and z

now, we can use arc length formula

now, we can find derivative

now, we can plug values
and we get



...........Answer
777 when rounded, or 777.1215418091389
If you are working out the number of KM per CM them you divide the KM by the CM:
15/0.75 = 20
This means that it is 20KM per every 1CM
Hope this helps! :)