About how long would it take for one of the footprints left by the apollo astronauts to be erased? (hints: use the moon's surface area to determine the impact rate per square centimeter, and suppose that a footprint has an area of 300 cm2)

it may be wrong but i think its a

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over