On a map with a scale of 1:5,000,000, the distance from Shanghai to Hangzhou is measured to be 3.4 centimeters. If a car travels from Shanghai to Hangzhou at a speed of 85 kilometers per hour, how many hours will it take?
在比例尺是1：5,000000的地图上，量得上海到杭州的距离是3.4厘米，如果一辆汽车以每时85千米的速度从上海开往杭州，要多少小时？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">3.4 / (1/5_000_000) / 100_000 / 85</gadget>
<output>2</output>

<result>2</result>