It takes 2 hours to drive 80 miles and 4 hours to drive 160 miles. Find the rate of change. I need this asap

Ms. aniston asked seven students in her class to collect pet food cans for a local animal shelter. the dot plot shows the number of food cans collected by each student. each dot represents one student. what is the median of the data set? a. 6 b. 9 c. 7 d. 8