A man can row 40 km upstream and 55 km downstream in 13 h. Also, he can row 30 km upstream and 44 km downstream in 10 h. Find the speed of the man in the still water.
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40/x-y +55/x+y =14--------(i)
30/x-y+44/x+y=10-----------(ii)
cross multiply both eq. and eliminate them so u get ans.
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