On a map with a scale of 1:6,000,000, the length of the road between A and B is measured to be 5 cm. How many hours does it take for a car to travel from city A to city B at an average speed of 75 kilometers per hour?
在一幅比例尺是1：6000000的地图，量得甲、乙两城之间的公路长5厘米．一辆汽车以平均每小时75千米的速度从甲城开往乙城，需要多少小时才能到达？
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">5 / (1/6_000_000) / 100_000 / 75</gadget>
<output>4</output>

<result>4</result>