Two ships, A and B, sail from point A to point B at the same time. Ship A travels 35 km per hour, and ship B travels 28 km per hour. After 6 hours, how many kilometers has the boat A traveled more than the boat B?
甲、乙两艘轮船同时从A地开往B地．甲船每小时行驶35千米，乙船每小时行驶28千米．经过6小时，甲船比乙船多行了多少千米？
<gadget id="calculator">35 - 28</gadget>
<output>7</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<result>42</result>