A car travels from city A to city B at 85 kilometers per hour, and travels 25 kilometers past the midpoint for 4 hours. How long is the highway between A and B?
一辆汽车从甲城开往乙城，每小时行85千米，行了4小时超过中点25千米．甲、乙两城间公路长多少千米？
<gadget id="calculator">85 * 4</gadget>
<output>340</output>

<gadget id="calculator">340 - 25</gadget>
<output>315</output>

<gadget id="calculator">315 * 2</gadget>
<output>630</output>

<result>630</result>