Xiao Ming goes to grandma's house by train. She measures the distance between the two places on a map with a scale of 1:8,000,000 to be 5 cm. If the train travels 160 kilometers per hour. How many hours can she get to grandma's house?
小明乘火车去姥姥家，她在比例尺为1：8000000的地图上量得两地距离为5厘米，如果列车每小时行160千米．她几小时才能到达姥姥家？
<gadget id="calculator">1 / 8_000_000</gadget>
<output>1/8_000_000 = around 0</output>

<gadget id="calculator">5 / (1/8_000_000) / 100_000 / 160</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>