Math, asked by srishtibhardwaj71, 4 months ago

a man takes twice as long to row up as to row down the river if the rate of river is 4 km/h. find the rate of the man in still water.
step by step explanation please ​

Answers

Answered by 209131520625
2

Answer:

Rate of stream = 3 kmph

Step-by-step explanation:

Speed of the boat in still water =9 km.. Let D be the distance. It takes him twice the time to row upstream compared to downstream.

Let speed of the current be x kmph

Speed downstream =(9+x)

Speed upstream = (9-x)

Ratio of time taken for upstream to time taken for downstream = D/(9-x) ÷ D/(9+x) =1/2

2 (9 - x)= 9+x

18 -2x = 9+x

-3x =-9 hence x = 3

Rate of stream = 3 kmph.

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