how long will it take for a plate that moves 20 mm per year to travel the distance of one football field

Question

 football field is 91.44 (100 yards long )

Answer 1

The conversion from yards to millimeters (mm) is:

1 yard = .9144m = 914.4 mm

100 yards = 91440 mm

#years = 91440 mm / (20 mm/year)

= 4572 years