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?
How many trees were there? ** There were 4*5=<<4*5=20>>20 trees to clean
How many minutes did it take to clean the trees? ** So it took 20*6=<<20*6=120>>120 minutes
How many hours did it take to clean the trees? ** That is 120/60=<<120/60=2>>2 hours
How many hours did he spend cleaning trees? ** So he spent 2/2=<<2/2=1>>1 hour cleaning
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