a man rows 20 km downstream and 16km upstream taking 4 hrs each time. what is the speed of the current?
Answers
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Step-by-step explanation:
Let the speed of boat in still water be x km/h
Now
In Upstream, we know that
Speed of Boat = Speed of boat in still water - speed of river current
∴ Speed of boat in upstream = x - 5
Distance iBken in upstream = 8/(x-5) [Time = distance/speed] --- ( i )
In Downstream
Speed of boat = Speed of boat in still water + speed of river current
∴ Speed of boat in downstream = x + 5
Distance = 12 km
∴ Time taken in downstream = 12/(x + 5) --- ( ii )
According to question
Time taken in upstream = time taken in downstream
∴ Eq ( i ) = Eq ( ii )
8 ( x + 5) = 12 ( x - 5 )
8x + 40 = 12x - 60
4x = 100
x = 25
∴ Speed of boat in still water is 25km/h
Answered by
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Answer:
0.5 km/hr is the correct answer
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