i need help figuring this out.

ben starts walking along a path at 3 mi/h. one and a half hours after Ben leaves, his sister amanda begins jogging along the same path at 7 mi/h how long (in hours) will it be before Amanda catches up with Ben?

Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 5 more than 3 times the number of marbles Mark has, how many does each boy have to sell if the total number ofmarbles is 81? Mark has [Number marbles to sell. Don has INumber marbles to sell. Show your work and explain how you arrived at your answers. There are sample student explanations in the feedback to questions 1, 3, 5, 9, 11, and 20 that show the level of detail that is expected in your explanations. c. 2... AQEE; 3% [2 [1' [11:0, ;: ::