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

### Instruction:
When it rains, the three holes in the garage roof leak water at different rates.  The largest hole leaks at a rate of 3 ounces of water  per minute.  The medium-sized hole leaks water at one-half the rate of the largest hole.  And the smallest hole leaks water at a rate of one-third the rate of the medium-sized hole.  When it rains, what is the combined amount of water, in ounces, that leak from all three holes over a 2-hour time period?

### Response:
If the largest hole leaks at a rate of 3 ounces of water per minute, the medium-sized hole leaks at one-half that rate for a rate of one-half*3=<<3*1/2=1.5>>1.5 ounces per minute.
And the smallest-sized hole leaks at one-third the rate of the medium-sized hole for a rate of 1.5*(1/3)=0.5 ounces per minute.
Combined, the three holes leak at a rate of 3+1.5+0.5=<<3+1.5+0.5=5>>5 ounces per minute.
Since one hour is 60 minutes, two hours is 2*60=<<2*60=120>>120 minutes.
In total, over the two hours, the holes will leak a combined 120*5=<<120*5=600>>600 ounces of water.
#### 600