The velocity of a boat in still water is 9 km/hr, and the speed of the stream is 2.5 km/hr. How much time will the boat take to go 9.1 km against the stream? A. 2hr. 40min B. 1 hr. 20min C. 2hr. 48min D. 1hr. 24min Answer Workspace Report Discuss Answer with explanation Answer: Option D Explanation Answer with the Explanation: ATQ, Speed of boat in still water (Sb) = 9km/hr Speed of stream (Sc) = 2.5km/hr Distance against the stream = 9.1 km Note: against the steam = upstream Now, apply the formula: The speed of boat upstream = speed of boat – the speed of the stream The speed of upstream = 9-2.5 = 6.5km/hr Now, time= Distance/speed Time = 9.1/6.5, or 7/5 Or, time = 1[2/5] Or, 1hr + (2/5)*60 = 1hr + 24minutes Workspace
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