The distance between the two places is 360 kilometers. It takes 10 hours for a motorboat to travel along the water. It is known that the current speed of this river is 6 kilometers per hour. What is the average speed of the two places in kilometers per hour?
两地相距360千米，一艘汽艇顺水行全程需要10小时，已知这条河的水流速度为每小时6千米，往返两地的平均速度是每小时多少千米？
<gadget id="calculator">360 + 360</gadget>
<output>720</output>

<gadget id="calculator">360 / 10</gadget>
<output>36</output>

<gadget id="calculator">36 - 6 - 6</gadget>
<output>24</output>

<gadget id="calculator">360 / 24</gadget>
<output>15</output>

<gadget id="calculator">10 + 15</gadget>
<output>25</output>

<gadget id="calculator">720 / 25</gadget>
<output>144/5 = around 28.8</output>

<result>144/5 = around 28.8</result>