The speed of a boat in still water is 4 , km/ | vedclass

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(D) Let the speed of the boat in still water be $x = 4 \, km/h$ and the speed of the current be $y = 2 \, km/h$.The speed upstream is $(x - y) = 4 - 2

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$3$

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(D) Let the speed of the boat in still water be $x = 4 \, km/h$ and the speed of the current be $y = 2 \, km/h$.The speed upstream is $(x - y) = 4 - 2 = 2 \, km/h$.The time taken to cover distance $d$ upstream is $9 \, hours$.Using the formula $	ext{Distance} = 	ext{Speed} 	imes 	ext{Time}$,we have $d = 2 	imes 9 = 18 \, km$.The speed downstream is $(x + y) = 4 + 2 = 6 \, km/h$.To find the time $t$ taken to cover the same distance $d$ downstream,we use $t = \frac{d}{	ext{Speed downstream}}$.$t = \frac{18}{6} = 3 \, hours$.

The speed of a boat in still water is $4 \, km/h$ and the speed of the current is $2 \, km/h$. If the time taken to reach a certain distance upstream is $9 \, hours$,find the time it will take to go the same distance downstream (in $hrs$).

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