bus departs from A to B at 12:00 noon and arrives at B at 4:00 p.m. The distance from A to B is 160 km. How many kilometers per hour does this bus travel on average?
一辆客车中午12时从甲地出发去乙地，下午4时到达乙地．甲地到乙地的路程是160千米．这辆客车平均每小时行驶多少千米？
<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<gadget id="calculator">160 / 4</gadget>
<output>40</output>

<result>40</result>