A and B carry a total of 100 kilograms of luggage on a ship. A pays 4.6 yuan for the overweight part, and B pays 5.4 yuan for the overweight part. If the luggage carried by A and B is carried by one person, the overweight part should pay 15 yuan, and how much is the weight of luggage that each person can carry for free.
甲、乙两人共携带100千克的行李乘轮船，甲超重部分交款4.6元，乙超重部分交款5.4元．如果甲、乙两人携带的行李归一人携带，则超重部分应交款15元，每人可免费携带行李的重量是多少．
<gadget id="calculator">4.6 + 5.4</gadget>
<output>10</output>

<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">100 / 15</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">10 - (20/3)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) - (1/15)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(10/3) / (2/15)</gadget>
<output>25</output>

<result>25</result>