Question

ritu can row downstream 20 km in 2 hrs and upstream 4km in 2 hrs find her speed of rowing in still water and speed of current

Answer 1

Hey friend!!


Here's ur answer...


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Let speed of current be x km/hr.

Speed of rowing be y km/hr.

So, speed upstream = (y - x) km/hr
Speed downstream = (x + y) km/hr


Speed = distance /time

According to question :

Upstream =
$y - x = \frac{4}{2} \\ \\ y - x = 2 - - - - - (1)$


Downstream =

$x + y = \frac{20}{2} \\ \\ x + y = 10 - - - - (2)$


Adding (1) & (2)


y - x + x + y = 2 +10
2y = 12
y = 6 km/hr.

Put in (1)

6 - x = 2
- x = - 4
x = 4 km/hr.


So, speed of current = 4 km/hr

Speed of rowing = 6 km/hr.


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Hope it may help you...



Thank you :) :)))