There is a pile of coal, and it is planned to burn 0.5 tons per day, which can last for 60 days; actually burn 0.4 tons per day, how many days can it actually burn?
有一堆煤，计划每天烧0.5吨，可以烧60天；实际每天烧0.4吨，实际可以烧多少天？
<gadget id="calculator">0.5 * 60</gadget>
<output>30</output>

<gadget id="calculator">30 / 0.4</gadget>
<output>75</output>

<result>75</result>