Xiao Ming runs 7 meters per second and Xiao Li runs 3 meters per second. They start running from both ends of the 100-meter track at the same time. How many seconds will they meet?
小明每秒跑7米，小利每秒跑3米，两人从百米跑道两端迎面同时起跑，两人将在多少秒后相遇．
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<result>10</result>