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THE ROWING SPEED OF A MAN IN STILL WATER IS 20KM/H. GOING DOWNSTREAM, HE MOVES AT A RATE OF 35KM/H. WHAT WILL BE THE RATE OF THE STREAM? IS IT 10KM/H.IF YES CAN YOU PLEASE EXPLAIN.
Downstream speed,u = 35 km/hr
Speed of man,x = 20 km/hr
Here we have to find the rate of the stream,y.

Downstream speed u = x+y
                                 35 = 20 + y    
Rate of the stream,y = 35 - 20 = 15 km/hr


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