Question
The speed of a boat in still water is 12 km/h and the
speed of the current is 3 km/h. A person travels 270 kilometers in a boat in the upstream direction and returns to the starting point in the downstream direction. Find the time taken to cover the entire journey.Solution
Let the speed of boat in still water =B and speed of stream =S B=12km/h, S= 3km/h Speed of the boat in upstream =B-S=9km/h Speed of the of the boat in Downstream =B+S =15km/h ATQ- Total time = (270/9 +270/15) =30+18=48hours.
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