07-16-2014, 08:55 PM
The book I'm using shows me how to solve but I'm getting a little confused at the end:
First
Add together what they can do individually per hour: 1/12 + 1/8 = 5/24 (Makes sense)
Second
Let "t" stand for how long they take to do the job together. (Okay)
Third
Then they can do 1/t per hour, so 5/24 = 1/t. When for t = 24/5, t = 4.8 hours (WTF)
Quote:Suppose one painter can paint the entire house in twelve hours, and the second painter takes eight hours. How long would it take the two painters together to paint the house?
First
Add together what they can do individually per hour: 1/12 + 1/8 = 5/24 (Makes sense)
Second
Let "t" stand for how long they take to do the job together. (Okay)
Third
Then they can do 1/t per hour, so 5/24 = 1/t. When for t = 24/5, t = 4.8 hours (WTF)