There are two water pipes above the barrel, if one of them is opened alone, the empty bucket can be filled with water in 24 minutes; if the other is opened alone, the empty bucket can be filled with water in 15 minutes. The small hole flows out, and a full bucket of water can be left in 2 hours. If two water pipes are opened at the same time and the small hole at the bottom of the bucket is opened, how long will it take for the bucket to be filled?
木桶上方有两个水管，单独打开其中一个，24分钟可将空水桶灌满水；若单开另一个，则15分钟可将空水桶灌满水，木桶底下有一个小孔，水从小孔中往外流，一满桶水2小时可以留完．若同时打开两个水管，并开放桶底小孔，那么，经过多少时间水桶才能装满？
<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 120</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">(1/15) - (1/120)</gadget>
<output>7/120 = around 0.058333</output>

<gadget id="calculator">(1/24) + (7/120)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>