The engineering team excavated a 0.7-kilometer-long tunnel. It used to be 0.024 kilometers per day for 15 days. The rest will be completed in 10 days. On average, how many days should be excavated per day?
工程队开凿一条长0.7千米的隧道，原来每天开凿0.024千米，开凿了15天．余下的用10天完成．平均每天应开凿多少天？
<gadget id="calculator">0.024 * 15</gadget>
<output>0.36</output>

<gadget id="calculator">0.7 - 0.36</gadget>
<output>0.34</output>

<gadget id="calculator">0.34 / 10</gadget>
<output>0.034</output>

<result>0.034</result>