Posted by wes on Monday, January 11, 2010 at 10:55pm.
A mail handler needs 3 hours to sort the mail, but with an assistant, it takes 2 hours. How long would it take the assistant to sort the mail working alone?

Math  drwls, Tuesday, January 12, 2010 at 1:31am
Let that assitant's time be t.
1/2 = 1/t + 1/3 jobs per hour
1/t = 1/6
t = 6 hours