Question

Which rate of speed?Drive a car at rate of 40 kilometers per hour ORDrive a car at a rate of 15 meters per second

Answer 1

For a car is better to use kilometers per hour,

Because the distance that the car can reach in a short time is bigger than a meter so it's more comfortable using a multiple as km. Also is easier count the time in hours because the number of seconds will be huge for example for travel of only 1 hour we will have 3600 seconds

that's why it is better to use km per hour