Mom takes Xiao Ming to see grandma by long-distance bus. It departs at 8:00 am and arrives at 12:00 noon. The bus travels 85 kilometers per hour. How many kilometers is it from Xiao Ming's house to grandma's house?
妈妈带小明坐长途汽车去看奶奶，早上8时出发，中午12时到达，汽车每小时行85千米．从小明家到奶奶家有多少千米？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">85 * 4</gadget>
<output>340</output>

<result>340</result>