It takes 8 hours for line A to complete the journey, and 10 hours for line B to complete the journey. The two vehicles are traveling towards each other from the two places at the same time. ?
甲行完全程要8小时，乙行完全程要10小时，两车同时从两地相向而行，相遇时甲行了全程的(7/15)还多4千米，求全程有多少千米？
<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">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(5/9) - (7/15)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">4 / (4/45)</gadget>
<output>45</output>

<result>45</result>