Congcong and Mingming are in the same swimming pool, Congcong swam 3 back and forth, Mingming swam 5 back and forth. Mingming swam 100 meters more than Cong Cong, how many meters is a round trip?
聪聪和明明在同一个游泳池，聪聪游了3个来回，明明游了5个来回．明明比聪聪多游了100米，游一个来回是多少米？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>