Answer :

  4.28 m/s

Average Speed is defined as Total Distance Traveled ÷ Total Time Taken . SI unit of average speed is meter per second ( m/s).

Average Speed = total distance traveled ÷ total time taken

we have , jessica's car travelled 40 m in 10 sec

kristi's car travelled 40 m in 20 sec

laticia's car travelled 40m in 8 sec

Average Speed = total distance traveled ÷ total time taken

so,                          = 40+40+40 ÷ 10+20+8

                                  = 120÷28

                                = 4.28 m/s

  • average speed  is a scalar quantity. It is represented by the magnitude and does not have direction.

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