On a map with a scale of 1:4500000, the length of the road between A and B is measured to be 6.4cm. How long does it take for a car to drive from A to B at a speed of 75km per hour?
在比例尺是1：4500000的地图上，测得甲乙两地之间的公路长6.4cm，车以每小时75km的速度从甲地开往乙地，需要多长时间？
<gadget id="calculator">1 / 4_500_000</gadget>
<output>1/4_500_000 = around 0</output>

<gadget id="calculator">6.4 / (1/4_500_000) / 100_000 / 75</gadget>
<output>3.84</output>

<result>3.84</result>