Bob can do a job in 5 hours while bill can do the same job in 8. how many hours would it take them, working together, to do this job?

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220