A man can row 4 kmph in still water. if the river is running at 2 kmph it takes 90 min to row to a place and back. how far is the place?
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down stream =x+y
up srteam=x-y
(x+y)-(x-y) =d/90
2y=d/90
2(2)=d/90
4=d/90
4=d/90/60
4=60d/90
4=6d/9
4=2d/3
2d=4×3
2d=12
d=12/2
d=6km is answer obtained
up srteam=x-y
(x+y)-(x-y) =d/90
2y=d/90
2(2)=d/90
4=d/90
4=d/90/60
4=60d/90
4=6d/9
4=2d/3
2d=4×3
2d=12
d=12/2
d=6km is answer obtained
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