car delivers goods from place A to place B. When it goes there, it travels at a speed of 45 km/h for 12 hours; when it returns, it takes only 9 hours to return to place A because it is empty. Then the return speed How much faster than before?
一辆汽车从甲地开往乙地送货，去时以45千米/时的速度行驶了12小时到达；返回时由于是空车只用了9小时就回到了甲地，那么返回的速度比去时快了多少？
<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">45 * (4/3)</gadget>
<output>60</output>

<gadget id="calculator">60 - 45</gadget>
<output>15</output>

<result>15</result>