A ship departs from A, travels 36 kilometers per hour, and arrives at B in 25 hours. It only took 20 hours for the ship to return from point B to point A. How many kilometers per hour did the ship travel on average when returning?
一艘轮船从甲地出发，每小时航行36千米，25小时到达乙地．这艘轮船从乙地返回甲地只用了20小时，返回时轮船平均每小时航行多少千米？
<gadget id="calculator">25 / 20</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">36 * (5/4)</gadget>
<output>45</output>

<result>45</result>