The east and west villages are 36 kilometers apart. A and B set off from the east and west villages at the same time. Three hours later, C rides his bicycle from the east village to pursue A. As a result, the three meet at a certain place at the same time. It is known that A A person travels 4 kilometers per hour, B travels 5 kilometers per hour, find C's speed.
东、西两村相距36千米，甲、乙二人同时从东西两村相向出发，3小时后，丙骑车从东村出发去追甲，结果三人同时在某地相遇，已知甲每小时行4千米，乙每小时行5千米，求丙的速度．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">36 / 9 / 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>