On a map with a scale of 1:4,000,000, the length of the roads in A and B is 8 cm. If a car starts from point A and travels along the road at a speed of 50 kilometers per hour, how many hours will it take to reach point B?
在比例尺是1：4000000的地图上，量得A、B两地公路长8厘米．如果一辆汽车从A地出发，以每小时50千米的速度，沿公路前进，大约多少小时到达B地？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">8 / (1/4_000_000) / 100_000 / 50</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>