Answers

2015-01-23T13:38:43+05:30


Let x miles per hr be the speed of the stream; Speed of boat in still water is given as 10mph So,

Speed of boat downstream = 10+x mph

Speed of boat upstream = 10-x mph

36/(10-x) - 36/(10+x) = 90/60

72x*60 = 90(100-x^2)

x^2 + 48x - 100 = 0

(x+50)(x-2) = 0

Hence, x(Speed of stream) = 2mph

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