Two cars, A and B, drive opposite each other at a distance of 920 kilometers. Car A travels 85 kilometers per hour, and car B travels 65 kilometers per hour. Car A travels first for 2 hours before car B starts. How many hours does it take for car B to meet car A?
甲、乙两车相距920千米的两地相对开出，甲车每小时行驶85千米，乙车每小时行驶65千米，甲车先行了2小时，乙车才出发．乙车出发几小时与甲车相遇？
<gadget id="calculator">85 * 2</gadget>
<output>170</output>

<gadget id="calculator">920 - 170</gadget>
<output>750</output>

<gadget id="calculator">85 + 65</gadget>
<output>150</output>

<gadget id="calculator">750 / 150</gadget>
<output>5</output>

<result>5</result>