A convoy transported a batch of disaster relief supplies. It was originally planned to travel 60 kilometers per hour and arrive at the disaster area in 7.5 hours. It actually arrived at the disaster area 1.5 hours earlier. How many kilometers per hour did it actually travel?
某车队运送一批救灾物资，原计划每小时行60千米，7.5小时到达灾区，实际提前1.5小时到达灾区，实际每小时行多少千米？
<gadget id="calculator">60 * 7.5</gadget>
<output>450</output>

<gadget id="calculator">7.5 - 1.5</gadget>
<output>6</output>

<gadget id="calculator">450 / 6</gadget>
<output>75</output>

<result>75</result>