Xiaoming's house used to have 3 Haier air conditioners, but he bought another one this summer. If all 4 air conditioners are turned on, the fuse will be blown, so only 3 air conditioners can be turned on at most. In this way, how many hours can each air conditioner be used on average within 24 hours.
小明家原来有3台海尔空调，今年暑假又买了一台．如果4台空调全部打开时就会烧断保险丝，因此最多只能打开3台空调．这样在24小时内平均每台空调最多可以使用多少小时．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 * (3/4)</gadget>
<output>18</output>

<result>18</result>