Question
Download Solution PDFA boat is moving in still water at a speed of 15 km/h. The speed of the stream is 3 km/h. How much time will the boat take to cover 6 km upstream?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Boat speed in still water = 15 km/h
Stream speed = 3 km/h
Distance = 6 km
Concept:
The effective speed of the boat upstream (against the current) is the difference of the boat's speed and the stream's speed. Time = Distance/Speed.
Solution:
Upstream speed = Boat speed - Stream speed = 15 km/h - 3 km/h = 12 km/h
Time = Distance/Speed = 6 km/12 km/h = 0.5 hours = 30 minutes
Therefore, the boat will take 30 minutes to cover 6 km upstream.
Last updated on Jul 7, 2025
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