英语翻译
ThereisaroadbetweensiteAandsiteB.JiawalksfromAtoB.YikeepscommutingfromAtoBbymotorbikewithoutstop.IfJiaandYibothstartfromAatthesametime,theymeetforthefirsttimeafterthirteenminutes,thenYiovertakesJiaforthefirsttimeafterfiveminutes.WhenJiagetstosideB,howmanytimedotheymeeteachotherontherejourney?()