A pile of coal, originally planned to burn 6 tons per day, can be burned for 240 days. After the stove is improved, it actually burns 4.5 tons per day. How many days can this pile of coal actually be burned? (Solve with ratio)
一堆煤，原计划每天烧6吨，可以烧240天，改进炉灶后，实际每天烧4.5吨，这堆煤实际可以烧多少天？(用比例解)
<gadget id="calculator">6 * 240</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 / 4.5</gadget>
<output>320</output>

<result>320</result>