SOLUTION: sheela can row a boat at the rate of 4km per hour in sill water.she takes 8 hrs in going 12km upstream and 12km downstream.find the speed of the stream.

Question 696791: sheela can row a boat at the rate of 4km per hour in sill water.she takes 8 hrs in going 12km upstream and 12km downstream.find the speed of the stream.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = time in hours to go 12 km upstream
= time in hours to go 12 km downstream
Let = the speed of the stream in km/hr
= Sheela's speed going upstream in km/hr
= Sheela's speed going downstream in km/hr
-------------------
Her equation going upstream:
(1)
Her equation for going downstream:
(2)
--------------------------
(2)
(2)
(2)
(2)
Substitute (2) into (1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
The speed of the stream is 2 km/hr
check answer:
(1)
(1)
(1)
and
(2)
(2)
(2)
(2)
(2)
OK

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