Question

A car travels 600m in 30s.What is its average speed? Why is its actual speed usually different from its average speed?

Answer 1

The average speed will be distance/time= 600/30
                                                         =20m/s
 

Answer 2

speed=dist/time=600/30=20 m/s
actual speed is different from its average speed because every time a person can't drive with a constant speed.and average speed means that average distance travelled in total interval of time.