A ship departs from Port A at 8 am and arrives at Port B at 21:00 on the same day, with an average speed of 38 kilometers per hour. How many kilometers is the distance between Port A and Port B?
一只轮船上午8时从甲港出发，当天21时到达乙港，平均每小时航行38千米，甲港到乙港相距多少千米？
<gadget id="calculator">21 - 8</gadget>
<output>13</output>

<gadget id="calculator">38 * 13</gadget>
<output>494</output>

<result>494</result>