Ok so ive been playing around with this, and i think its pretty simple...but i just cant figure it out. A worker can cover a parking lot with asphalt in 10 hours. With the help of an assistant the work can be done in 6 hours. How long would it take the assistant working alone to cover the parking lot? The answer i got was 12...because if they are both working for 6 hours, and they cover it, that is 6 hours of work each splitting the job, so if the assistant does both halves of the work, he would have worked for 12 hours. Please help, lemme know if im doing it wrong.