Xiaodong plans to visit the ape-man ruins in Zhoukoudian. If he travels by car at a speed of 40 km/h, it will be 3 hours earlier than cycling, and if he is walking at 8 km/h, then it will be 5 hours later than cycling. Xiaodong’s starting point How many kilometers is it to Zhoukoudian?
小东计划到周口店参观猿人遗址．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>