Uncle Wang sells two barrels of apples with the same unit price, one barrel is 18 kilograms, the other barrel is 24 kilograms; the price difference between the two barrels of apples is 10.8 yuan. What is the average price of an apple per kilogram?
王大伯卖出两桶单价相同的苹果，一桶是18千克，另一桶是24千克；两桶苹果所卖的钱相差10.8元．平均每千克苹果的价钱是多少元？
<gadget id="calculator">24 - 18</gadget>
<output>6</output>

<gadget id="calculator">10.8 / 6</gadget>
<output>1.8</output>

<result>1.8</result>