Question
A man can swim at a speed of 5.5 km/hr in still water.
He swims upstream from a certain point in the river and then back to the same point. If the speed of the current of the river is 2.5 km/hr. Find the average speed of his total journeySolution
Given; speed of man in still water = 5.5 km/h  Speed of stream = 2.5 km/h Speed in upstream = 5.5 – 2.5 = 3 km/h Speed in downstream = 5.5 + 2.5 = 8 km/h Average speed= =(2s1 s2)/(s1+s2 ) =(2×3×8)/(3+8)=48/11 =4.36km/h
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