A boat takes half time in moving a certain distance downstream than upstream. What is the ratio between the rate in still water and rate of current? A. 1 : 2 B. 3 : 1 C. 2 : 1 D. 1 : 3 Answer Workspace Report Discuss Answer with explanation Answer: Option B Explanation Let the speed of the boat in still water be 4 km/hr and speed of the current be u km/hr. Rate downstream = (u + v) km/hr. Rate upstream = (u- v)km/hr Let the distance covered in each case be x km. Then 2x/(u + v) = x / (u – v) => 2 (u – v) = ( u + v) => u =3v => u/v =3/1 Workspace
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