Rachel is an artist. She posts a speed painting video each week on her Instagram account to promote her work. To save time, she paints and records 4 videos at a time. It takes her about 1 hour to set up her painting supplies and her camera. Then she records herself painting for 1 hour per painting. She takes another 1 hour to clean up. Each video takes 1.5 hours to edit and post. How long does it take Rachel to produce a speed painting video? Let's think first. Chain of thought:
Rachel spends 1 + 1 = 2 hours setting up and cleaning up. She paints for 1 hour x 4 paintings = 4 hours. Then she edits 1.5 hours x 4 videos = 6 hours. She spends 2 + 4 + 6 = 12 hours to make 4 videos. So Rachel spends 12 / 4 = 3 hours on each video.
Therefore, the answer is 3.