Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Kulikuwa na miti 4*5=<<4*5=20>>20 ya kusafisha.
Hivyo ilichukua 6*20=<<6*20=120>>120 dakika.
Hiyo ni sawa na 120/60=<<120/60=2>>2 saa.
Hivyo, alitumia 2/2=<<2/2=1>>1 saa kusafisha.