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23. Asteam boat goes across a lake and comes back on aquiet day, when the water is still and on a rough daywhen there is a uniform current so as to help thejourney onwards and impede the journey backIf speed of launch on both days was same but timetaken in quiet day is ti and on rough day is t2, then(2) ti t2(4) nothing can't be said(3) tit2

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