Question

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Answer 1

Average speed = 40km/h

Average Formula = Sum of all info / number of infos

                             = speed 1 + speed 2 / 2

                       40 = v +60 /2

                40 x 2  = v + 60

                      80  = v + 60

                 80-60 = v

                       20 = v

Therefore v = 20km/h

Answer 2

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Average speed = 40km/h

Average Formula = Sum of all info / number of infos

                             = speed 1 + speed 2 / 2

                       40 = v +60 /2

                40 x 2  = v + 60

                      80  = v + 60

                 80-60 = v

                       20 = v

Therefore v = 20km/h