On a map with a scale of 1:30000000, the distance from point A to point B is 6.5 cm. If a car travels the entire distance in two days according to the ratio of 1:4, what is the difference in kilometers between the two days?
在比例尺是1：30000000的地图上，量得甲地到乙地的距离是6.5厘米，一辆汽车按1：4的比例分两天行完全程，两天行的路程差是多少千米．
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">6.5 / (1/30_000_000) / 100_000</gadget>
<output>1_950</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_950 * (3/5)</gadget>
<output>1_170</output>

<result>1_170</result>