The distance between the two docks is 240 kilometers. Ship A takes 10 hours to travel along the current, 15 hours to travel upstream, and 16 hours to travel upstream.
两个码头相距240千米，甲船顺水行完全程用10小时，逆水行完全程用15小时，乙船逆水行完全程用16小时，乙船顺水每小时行多少千米．
<gadget id="calculator">240 / 15</gadget>
<output>16</output>

<gadget id="calculator">240 / 16</gadget>
<output>15</output>

<gadget id="calculator">240 / 10</gadget>
<output>24</output>

<gadget id="calculator">24 - 16</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">15 + 4 + 4</gadget>
<output>23</output>

<result>23</result>