Answers

2015-01-25T13:07:47+05:30
Let speed of boat be x and speed of stream be y

then,
x+y=11- - - - - - - -- 1
x-y=5  - - - - -  - - - -2
solving 1 and 2
we get x= 8

therefor speed of boat in still water is 8km/he

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