A man takes half time in rowing a certain distance downstream than upstream. What is the ratio or the speed in still water to the speed of current?
1 : 2
2 : 1
1 : 3
3 : 1
Let the speed in still water = s kmph and the speed of current = c kmph. Let distance is D km. Speed upstream = Speed in still water + Speed of current = s + c. Speed downstream = Speed in still water – Speed of current = s – c. Time upstream = Distance/Speed upstream = D/(s –c) …(1) and Time downstream = Distance/Speed downstream = D/(s+c) …(2) By the condition given in question Time upstream/2 = Time downstream
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