Answer:
1.35
Step-by-step explanation:
I believe this is right but it could be wrong. Hope this helps! <3
to get the equation of any straight line, we simply need two points off of it, let's use the ones provided in the picture below.


The 1 and 1 represent the 2 friends.
It is 800 b because 40 times 20 ( half of 40 =800