A ship delivers goods from port A to port B. It travels 36 kilometers per hour and arrives in 12 hours. When it returns, it takes 3 hours less than when it went there. How much more kilometers does it travel per hour on average?
一艘轮船从甲港往乙港送货物，每小时航行36千米，12小时到达，返回时，比去时少用了3小时，返回时平均每小时多行多少千米？
<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">36 * (4/3)</gadget>
<output>48</output>

<result>48</result>