Question

( rightarrow ) Letspeed of boot be se'rmiluy
( rightarrow ) Cet speed ot stream be ( y^{prime} ) ( k m / L gamma )
bood fired in wotrean ( (x-y) ) km / Lo boat speed in downstream ( (x+y) ) (cm/hr
Acc. to question
[
begin{array}{l}
frac{24}{x-y}+frac{28}{x+y}=6
frac{30}{x-y}+frac{21}{x+y}=6 cdot 5
end{array}
]
Let ( frac{1}{x-y} ) be ( p )
( 4 frac{1}{x+y} ) be 2
[
begin{array}{l}
therefore text { now } 24 p+28 z=6-0
30 p+212=65-0
6 times 5 text { & } 2 times 4
end{array}
]
( Rightarrow theta_{1}, 20 p+1402=30 )
( Rightarrow-frac{120 p+842=26}{562=4} )
Speed of boat ( log _{bmod } / mathrm{L}_{mathrm{v}} mathrm{x}=10 mathrm{km} / mathrm{hr} )
speed of strem 4 kn 1 hy

# 0.102 roes 30 km upstream 1 47A boat goes 24 km upstream and 28 km downstream in 6 hrs. It goes 30 km and 21 km downstream in 67 hrs. Find the speed of the boat in still water and also speed of the stream 111 lm

Solution