Lingling and Yaya are 200 meters apart, Lingling runs 3 meters per second in front, and Yaya runs 5 meters per second in the back. The two set off at the same time, walking in the same direction. Will Yaya catch up to Lingling in a few seconds?
玲玲和丫丫两人相距200米，玲玲在前每秒跑3米，丫丫在后每秒跑5米．两人同时出发，同向而行，几秒后丫丫能追上玲玲？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>