Anita can row a boat at the rate of 4kmph in still water. She takes 8 hours in going 12km upstream and 12km downstream. Find the speed of the stream.
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let the speed of steam be xkmper hr
speed of anita is 4km/hr
d=s*t t=d÷s
ATQ
12÷(4-x) +12÷(4+x)=8
{(12(4+x) +12(4-x)}÷{(4+x)(4-x)}
(36+12x+36-12x)÷16-x^2=8
72=128-8x^2
-56=-8x^2
56÷8= x^2
x=√7
speed of anita is 4km/hr
d=s*t t=d÷s
ATQ
12÷(4-x) +12÷(4+x)=8
{(12(4+x) +12(4-x)}÷{(4+x)(4-x)}
(36+12x+36-12x)÷16-x^2=8
72=128-8x^2
-56=-8x^2
56÷8= x^2
x=√7
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