When digging a canal, we dug 2.3 kilometers on the first day. On the second day, we dug 0.25 kilometers less than the first day, leaving 1.15 kilometers undug. How many kilometers long is this canal?
挖一条水渠，第一天挖了2.3千米，第二天比第一天少挖0.25千米，还剩下1.15千米没有挖，这条水渠长多少千米？
<gadget id="calculator">2.3 - 0.25</gadget>
<output>2.05</output>

<gadget id="calculator">2.3 + 2.05 + 1.15</gadget>
<output>5.5</output>

<result>5.5</result>