A swimmer can swim at a speed of 3.5 kilometers per hour in still water. If the time taken to cover a certain distance upstream is 2.5 times the time taken to cover the same distance downstream, then find the velocity of the stream.
Let the speed of boat in still water =B and speed of stream =S Distance =y Given -B=3.5km/h 
ATQ- 2(3.5+S) =5(3.5-S) 7+2S=17.5-5S 7S=10.5 S=10.5/7=1.5km/h
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