![]() (i)Īlso: 50 km upstream and 72 km downstream takes 9 hours ![]() (ii)Īssuming (m-r) = u and (m+r) = v and solving for u and v:ħ0 km upstream (U) and 90 km downstream (D) takes 12 hours. Let the speed of the man and current be m and r km/hr respectively He can also row 70 km upstream and 90 km downstream in 12 hours. A man can row 50 km upstream and 72 km downstream in 9 hours.
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