The distance between the two places is 36 kilometers, A walks in 12 hours, and B takes 4 hours in a bicycle. A and B start from two places at the same time and walk toward each other. How long can they meet each other? (Answer in two ways.)
两地相距离36千米，甲步行走完全程要12小时，乙骑车行完全程要4小时．甲乙两人从两地同时出发相向而行，几小时可以相遇？(用两种方法解答．)
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/12) + (1/4)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / (1/3)</gadget>
<output>3</output>

<result>3</result>