The distance between A and B is 845 kilometers. A truck departs from A at 8 am and arrives at B at 9 pm. How many miles per hour does this truck travel on average?
甲、乙两地相距845千米，一辆卡车上午8时从甲地出发，晚上9时到达乙地．这辆卡车平均每小时行多少千米？
<gadget id="calculator">21 - 8</gadget>
<output>13</output>

<gadget id="calculator">845 / 13</gadget>
<output>65</output>

<result>65</result>