###Human: Johnny is a dog walker. He can walk 3 dogs at once. He gets paid $15 for a 30-minute walk and $20 for a 60-minute walk. Johnny works for 4 hours per day. If he always walks the maximum number of dogs possible and 6 dogs have 60-minute walks per day, how much money does he make in a week where he works 5 days?, ### Assistant: Johnny spends 6/3=2 hours walking the 6 dogs who have 60-minute walks.
He makes $20*6=$120 for these walks.
Thus, he has 4-2=2 hours=120 minutes left to walk the other dogs.
He can walk 3*(120/30)=12 dogs in this time.
Thus, he will make $15*12=$180 on these walks.
In total per day, he makes $120+$180=$300 per day.
Thus, during the week, he makes $300*5=$1500. 
 So the answer is :  1500