Port A and port B are 200 kilometers apart. A ship travels from port A to port B at a speed of 32 kilometers per hour. After traveling for a while, it is still 72 kilometers away from port B. How many hours has the ship traveled?
甲乙两港相距200千米，一艘轮船以每小时32千米的速度从甲港开往乙港，行了一段时间后，距乙港还有72千米，这艘船行了多少小时？
<gadget id="calculator">200 - 72</gadget>
<output>128</output>

<gadget id="calculator">128 / 32</gadget>
<output>4</output>

<result>4</result>