How far apart are the staples in the finished part?

Question

An assembly line has a staple gun that rolls to the left at 1.20 m/s while parts to be stapled roll past it to the right at 2.90 m/s. The staple gun fires 14.0 staples per second. How far apart are the staples in the finished part?

Answer 1

The speeds add so the system is moving at 4.1 m/s

the stapler is 14 staples/second and we want staples/m so take 14/4.1=3.4 staples/m