A and B temporarily pay the same amount of money to buy back a batch of apples. As a result, A shares 15 kilograms more than B, so A has to pay another 9 yuan to B. How much is an apple per kilogram?
甲、乙两人暂付同样多的钱买回一批苹果．结果甲比乙多分15千克，这样甲要再付9元给乙．则苹果每千克多少元？
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">9 / (15/2)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>