The distance between A and B is 6 kilometers. Zhang Ming rides a bicycle from A to B for business, and must return within 55 minutes. If it takes 5 minutes to do the work, what should be the average speed of Zhang Ming's bicycle?
甲、乙两地相距6千米，张明骑车从甲地到乙地办事，55分钟内必须赶回．若办事需5分钟，张明骑车平均速度至少应是多少？
<gadget id="calculator">55 - 5</gadget>
<output>50</output>

<gadget id="calculator">2 / 50</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">6 * (1/25)</gadget>
<output>6/25 = around 0.24</output>

<result>6/25 = around 0.24</result>