There were 4*5=<<4*5=20>>20 trees to clean

So it took 20*6=<<20*6=120>>120 minutes

That is 120/60=<<120/60=2>>2 hours

So he spent 2/2=<<2/2=1>>1 hour cleaning

# Answer

1
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1
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?
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