A ship travels from port A to port B at a speed of 48 km/h, and it takes 5 hours to arrive. It only takes 4 hours to return with the wind. What is the speed of the ship when it returns?
一艘轮船从甲港开往乙港速度是48千米/时，共用5小时到达，返回时顺风只用了4小时，返回时轮船的速度是多少？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">48 * (5/4)</gadget>
<output>60</output>

<result>60</result>