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1. A man rows upstream 16 km and downstream 27 km talking 5 hours each time . What is the velocity of current? a) 2 km/hr b) 2.1 km/hr c) 1.1 km/hr d) 1.4 km/h e) None of these  Sol. (c); Man’s rate upstream=16/5 km/hr Man’s rate downstream=27/5 km/hr Velocity of the current=1/2 (27/5-16/5) km/hr=1.1 km/hr 2. A boat moves downstream at the rate of one km in 7(1/2) minutes and