Li Ming and Wang Yong rode bicycles opposite each other from counties A and B, which were 45.6 kilometers apart, and Wang Yong started after Li Ming rode 5.1 kilometers first. It is known that Li Ming traveled 12 kilometers per hour, and Wang Yong Traveling 15 kilometers per hour, ask Wang Yong how many hours after the two meet?
李明和王勇两人分别从相距45.6千米的甲乙县城相对骑车而行，而王勇是在李明先骑出5.1千米后才出发的，已知李明每小时行12千米，王勇每小时行15千米，问王勇出发几小时后两人碰面？
<gadget id="calculator">45.6 - 5.1</gadget>
<output>40.5</output>

<gadget id="calculator">12 + 15</gadget>
<output>27</output>

<gadget id="calculator">40.5 / 27</gadget>
<output>1.5</output>

<result>1.5</result>