a sailor can row a boat 8 km downstream and return back to the starting point in 1 hr 40 min .If the speed of the stream is 2 km per hr.Find the speed of the boat in still water.
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(8/x+2)+(8/x-2)=100/60
16x/x^2-4 = 5/3
5x^2-48x-20=0
x=(50,-2)/5
x=10
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