It takes 15 minutes for a truck to travel 14 kilometers, and only 9 minutes for a car to travel 14 kilometers. How many miles per minute does the car travel more than the truck?
一辆货车行14千米用了15分钟，一辆小汽车行14千米只用了9分钟．小汽车每分钟比货车多行多少千米？
<gadget id="calculator">14 / 9</gadget>
<output>14/9 = around 1.555556</output>

<gadget id="calculator">14 / 15</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">(14/9) - (14/15)</gadget>
<output>28/45 = around 0.622222</output>

<result>28/45 = around 0.622222</result>