In a race the mean time for three runners is 12.4 seconds and the mean time for another six runners was 11.5 seconds. calculate the mean time for all nine runners.

Will give brainliest for correct answer 8. use the distance time graph to answer these questions: a. what does the graph tell us about the velocity of the car? b. what is the average velocity of the car? (show work) c. is the velocity reflected in the graph positive or negative?d. is there any point on the graph where the car is not moving? how do we know?