Two people, A and B, are walking toward each other from two places 38 kilometers apart at the same time. A travels 4 kilometers per hour, B travels 5 kilometers per hour, and C travels 15 kilometers per hour with A starting in the same direction. Immediately turn back and go to A. When meeting A, how many kilometers did C travel in total?
甲、乙两人同时从相距38千米的两地相向而行，甲每小时行4千米，乙每小时行5千米，丙随甲同时同向出发每小时行15千米，遇乙马上回头向甲行去，遇甲时，丙共行了几千米？
<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">38 / 20</gadget>
<output>19/10 = around 1.9</output>

<gadget id="calculator">15 + 4</gadget>
<output>19</output>

<gadget id="calculator">(19/10) / 19</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">11 * (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) + (19/10)</gadget>
<output>3</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>