An airplane leaves Los Angeles for Denver at a speed of 440 mph. Thirty minutes later, a plane goinf from Denver to Los Angeles, which is 850 miles away from Los Angeles, at a speed of 470 mph. When they meet, how far are they from Denver

Before packaging and wrapping instruments, the dental assistant should dry off the instruments to avoid a. incomplete sterilization of the instruments. b. the possibility of stains forming. c. putting them away wet. d. corrosion, rust buildup, or dulling of the instruments.