Two cars move in the same direction, if the speed of the first car is 40km/h and the speed of the second car is 60km/h. Calculate the relative speed of the second car relative to observer: a. Standing on the ground
b. Passenger in the first car

Plss anybody know how to do this? ? i need the answers from a through d

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Is the time in tennessee the same as florida