What is the speed of a bus which travels at a distance of 480 km in 8 hours, convert the speed to meters per second?” anyone can answer it's for grade 7 and include the steps pls​

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.