The ratio of the number of days for A and B to travel a certain distance is 5:4, and the ratio of the number of days for B and C to travel this distance is 3:2, so how many days does it take for A to travel a distance of 15 days?
甲、乙两人行走某段路程的天数之比是5：4，乙、丙两人行走该段路程的天数之比是3：2，那么甲走15天的路程丙要走多少天．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / (3/2)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(5/4) / (2/3)</gadget>
<output>15/8 = around 1.875</output>

<gadget id="calculator">1 / (15/8)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(8/15) * 15</gadget>
<output>8</output>

<result>8</result>