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?
The medium-sized hole leaks at a rate of one-half that of the largest hole, or 3/2=
<gadget id="calculator">3/2</gadget>
<output>3/2 = around 1.5</output>
1.5 ounces per minute.
The small-sized hole leaks at a rate of one-third that of the medium-sized hole, or 1.5/3=
<gadget id="calculator">1.5/3</gadget>
<output>0.5</output>
0.5 ounces per minute.
Combined, the three holes leak at a rate of 3+1.5+0.5=
<gadget id="calculator">3+1.5+0.5</gadget>
<output>5</output>
5 ounces per minute.
Since one hour is 60 minutes, two hours is 2*60=
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 minutes.
In total, over the two hours, the three holes will leak a combined 120*5=
<gadget id="calculator">120*5</gadget>
<output>600</output>
600 ounces of water.

<result>600</result>