S a punishment for something naughty that we did, my little brother and I have to whitewash both sides of a fence. We start at t
he same time, and we each work at a constant rate. If we each whitewash one side, I'll finish in 2 hours and my brother will finish in 3 hours. But I'm a nice kid, so after I finish my side, I go around to the other side and help my brother finish his side. From the time I start helping him, how many minutes does it take us to finish the job?
Hint(s):
How many sides per hour can I paint? How about my brother? How about both of us together?
