A truck travels 45 kilometers per hour, reaches the destination in (5/6) hours, and only takes (3/4) hours to return along the original road. How many kilometers per hour does it travel on average when returning?
一辆卡车，每小时行45千米，(5/6)小时到达目的地，沿原路返回时只用了(3/4)小时，返回时平均每小时行多少千米？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(5/6) / (3/4)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">45 * (10/9)</gadget>
<output>50</output>

<result>50</result>