The two docks A and B are 160 kilometers apart. It takes 10 hours for a passenger ship to travel along the water. The current speed is 3 kilometers per hour. How many hours does it take for the passenger ship to travel upstream?
A、B两个码头相距160千米，一艘客船顺水行完全程需10小时，已知水流速度是每小时3千米，这艘客船逆水行完全程需几小时？
<gadget id="calculator">160 / 10</gadget>
<output>16</output>

<gadget id="calculator">16 - 3 - 3</gadget>
<output>10</output>

<result>16</result>