Answer:
108 minutes, or 1 hour 48 minutes.
Step-by-step explanation:
We know it takes 48 minutes for four to water the lawn. We need to know how much it takes for each individual station to run. To do that we divide 48 by 4, which gives us twelve.
We now know how long it takes for one sprinkler to run(12 minutes). Since there are nine sprinklers, we will multiply 12 by nine, which gives you 108 minutes. Or 1 hour 48 minutes.
