The distance between the two places is 2070km. Cars A and B are traveling towards each other from the two places at the same time. A travels 78km per hour, and B travels 60km per hour. After how many hours do they meet?
两地相距2070km，甲乙两车从两地同时相向而行，甲每小时行78km，乙每小时行60km，经过几小时相遇？
<gadget id="calculator">78 + 60</gadget>
<output>138</output>

<gadget id="calculator">2_070 / 138</gadget>
<output>15</output>

<result>15</result>