Question

A boat covers a certain distance downstream in 1 hour, while it comes back in 1½ hours. If the speed

of the stream is 3 km per hour, what is the speed of the boat in still water?

A) 12 km per hour B) 13 km per hour

C) 14 km per hour D) 15 km per hour ​

Answer 1

ANSWER

--------------------------⭐

Let the speed of the boat in still water be x kmph

Then

Speed downstream = (x + 3) kmph

Speed upstream = (x - 3) kmph

∴

$(x+3)×1=(x−3)×32$

$⇒2x+6=3x−9 \\ </p><p>⇒x=15kmph</p><p>$

$hope \: its \: help \: u$

Answer 2

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--------------------------⭐

Let the speed of the boat in still water be x kmph

Then

Speed downstream = (x + 3) kmph

Speed upstream = (x - 3) kmph

∴

$(x+3)×1=(x−3)×32(x+3)×1=(x−3)×32$

$\begin{gathered}⇒2x+6=3x−9 \\ ⇒x=15kmph\end{gathered} </p><p>$

$hope \: its \: help \: u$