Cars A and B are traveling towards each other from A and B at the same time, and they meet after (7/5) hours. It is known that car A travels 15 kilometers longer than car B per hour, and the speed of cars A and B is 5:4. How many kilometers are there between A and B?
甲乙两车从A、B两地同时相向而行，(7/5)时后相遇，已知甲车比乙车每时多行15千米，甲、乙两车的速度是5：4，A、B两地相距多少千米？
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">15 * (7/5)</gadget>
<output>21</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">21 / (1/9)</gadget>
<output>189</output>

<result>189</result>