1. The problem statement, all variables and given/known data Ok so for part ii) b) I calculated the average speed as follow, Average speed= 3792.6/ (2x266.67), where 3792.6m is the total distance, and 266.67s is the time when v=0 , i.e. the time from O to the turning point But it should be 3792.6/ 400, where 400s is the time when x=0 , i.e. returns to O I'm confused, why isn't the total time (2x266.67) ? What is there a difference in the time?