Let the place is at distance = d km. Effective velocity along the river flow =u+v=9.5+2.5=12 km/h Effective velocity against the river flow =u–v=9.5–2.5=7k
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Here, u and v are velocity with which a man can row in still water and velocity of still water respectively. Again, let time of row along the stream = t hr, so, time of row against the stream =(1.58–t)hr. According to the question, 12.t=d ⇒t=