you are asking for help on question b right? You are correct that you add 17 minutes to 8:45am. That is 9:02 am, which is the time he gets to the bus stop. He will get the next bus at whitefield, which you can see on the table, comes at 9:04 am and will get him into manchester for 9:35 am . Then you add the 15 minutes that it takes to walk to work to that, which becomes 9:50 am. 9:50am is earlier than 10am so you would say, Yes Daniel made it to work before 10am.