Xiao Ming plans to travel to the scenic spot. If he travels by car at a speed of 40 km/h, he will arrive 3 hours earlier than by bicycle. If he goes on foot at 8 km/h, he will arrive later than by bicycle. In 5 hours, how many kilometers is the distance from Xiaodong’s starting point to Zhoukoudian?
小明计划到风景区旅游，如果他坐汽车以40千米/小时的速度行驶，那么比骑车去早到3小时，如果他以8千米/小时的速度步行去，那么比骑车晚到5小时，小东的出发点到周口店有多少千米．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">40 - 8</gadget>
<output>32</output>

<gadget id="calculator">64 / 32</gadget>
<output>2</output>

<gadget id="calculator">2 * 40</gadget>
<output>80</output>

<result>80</result>