The convoy delivered a batch of relief supplies to the disaster area, traveled 60 kilometers per hour, and reached the disaster area in 6.5 hours. Arrive at the starting point 1.5 hours earlier when returning, how many kilometers per hour will be traveled when returning? (Solve with ratio)
车队向灾区运送一批救灾物资，去时每小时行60千米，6.5小时到达灾区．返回时提前1.5小时到达出发点，回来时每小时行多少千米？(用比例解)
<gadget id="calculator">60 * 6.5</gadget>
<output>390</output>

<gadget id="calculator">6.5 - 1.5</gadget>
<output>5</output>

<gadget id="calculator">390 / 5</gadget>
<output>78</output>

<result>78</result>