In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
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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
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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