Two motorboats sail from East Harbor to West Harbor, which is 324km apart. When Boat B arrives at West Harbor, Boat A is still 52.8km away from West Harbor. It is known that Boat B travels 54km per hour. How many kilometers does Boat A travel per hour?
两艘汽艇同时从东港开往相距324km的西港，当乙艇到达西港时，甲艇离西港还有52.8km，已知乙艇每小时行54km，甲艇每小时行多少千米？
<gadget id="calculator">324 - 52.8</gadget>
<output>271.2</output>

<gadget id="calculator">324 / 54</gadget>
<output>6</output>

<gadget id="calculator">271.2 / 6</gadget>
<output>45.2</output>

<result>45.2</result>