A and B are 13.7 kilometers apart, and they are walking towards each other. A travels 4.8 kilometers per hour, and B travels 4.2 kilometers per hour. A walks for 25 minutes before B sets off. How many minutes does B set off for the two to meet?
甲和乙两地相距13.7千米，他们相向而行．甲每小时行4.8千米，乙每小时行4.2千米．甲先走25分钟后乙才出发，乙出发几分钟两人相遇？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">4.8 * (5/12)</gadget>
<output>2</output>

<gadget id="calculator">13.7 - 2</gadget>
<output>11.7</output>

<gadget id="calculator">4.8 + 4.2</gadget>
<output>9</output>

<gadget id="calculator">11.7 / 9</gadget>
<output>1.3</output>

<gadget id="calculator">1.3 * 60</gadget>
<output>78</output>

<result>78</result>