Two cars A and B start from two places 2100 kilometers apart at the same time, and drive towards each other. Car A travels 80 kilometers per hour, and the speed of car B is (3/4) that of car A. Hour meet?
甲、乙两辆汽车同时从相距2100千米的两地出发，相向而行，甲车每小时行80千米，乙车的速度是甲车的(3/4)，两车开出后几小时相遇？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">80 * (3/4)</gadget>
<output>60</output>

<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">2_100 / 140</gadget>
<output>15</output>

<result>15</result>