On a map with a scale of 1:3,000,000, the distance between A and B is 5 cm. How many hours does it take for a car to travel from A to B at a speed of 50 kilometers per hour?
在比例尺是1：3000000的地图上，量得甲、乙两地的距离是5厘米，一辆汽车以每小时50千米的速度从甲地行驶到乙地，需多少小时到达？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">5 / (1/3_000_000) / 100_000 / 50</gadget>
<output>3</output>

<result>3</result>