A new asphalt road has been built in Xingfu Village, and now it needs to be compacted with a road roller. If a road roller rolls 2 kilometers a day, it can be finished in 9 days; now it is required to finish rolling the road in 6 days, how many kilometers does it need to roll every day?
幸福村新修了一条柏油马路，现在要用压路机进行碾压结实．压路机如果每天碾压2千米，9天可以碾压完；现在要求只能用6天的时间把路碾压完，每天要碾压多少千米？
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 * (1/3)</gadget>
<output>3</output>

<result>3</result>