Two brothers travel towards each other by cars from places A and B at the same time. The brother's car travels 55 kilometers per hour, and the brother's car travels 50 kilometers per hour. The two cars meet at a distance of 10 kilometers from the midpoint. Find the distance between A and B.
兄弟二人同时从A，B两地乘汽车相向而行，兄乘的车每小时行55千米，弟乘的车每小时行50千米，两车在距中点10千米处相遇．求A，B两地的距离．
<gadget id="calculator">55 + 50</gadget>
<output>105</output>

<gadget id="calculator">55 - 50</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<gadget id="calculator">105 * 4</gadget>
<output>420</output>

<result>420</result>