A car travels a distance of 74 meters in 7 seconds. What is the average speed of the car?

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

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?