Jack has a grove with 4 trees by 5 trees. It takes 6 minutes to clean each tree. He gets help to clean the trees so it only takes half as long. How many hours did he spend cleaning trees? Let's think first. Chain of thought:
User
There were 4 * 5 = 20 trees to clean. So it took 20 * 6 = 120 minutes. That is 120 / 60 = 2 hours. So he spent 2 / 2 = 1 hour cleaning.
Therefore, the answer is 1.
Assistant