Mathematics: a group of tourists went downstream a river and are supposed to return in 3 hours. how far can the tourists travel down the river if the speed of the current is 2 mph, and the speed of the boat in still water is 18 mph?

a group of tourists went downstream a river and

Ответ:

faithchambers15

03.01.2022

They were supposed to return in 3hrs, so down and up the stream is 3hrs total for the whole trip

the distance downstream and upstream is the same

$\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
\textit{downstream}&d&20&t\\
\textit{upstream}&d&16&3-t
\end{array}\\\\
-----------------------------\\\\

\begin{cases}
d=20t\\
d=16(3-t)\\
----------\\
20t=16(3-t)
\end{cases}\implies 20t=48-16t\implies 36t=48
\\\\\\
t=\cfrac{48}{36}\implies t=\cfrac{4}{3}\impliedby \textit{1hr and 20mins}
\\\\\\
\textit{what's "d"?}\qquad d=20t\implies d=20\cdot \cfrac{4}{3}\implies d=26\frac{2}{3}\ miles$

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Ответ:

Naysa150724

30.07.2022

Mathematics

3.42

Step-by-step explanation:

24/7=3.42

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a group of tourists went downstream a river and are supposed to return in 3 hours. how far can the tourists travel down the river if the speed of the current is 2 mph, and the speed of the boat in still water is 18 mph?

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￼a group of tourists went downstream a river and are supposed to return in 3 hours. how far can the tourists travel down the river if the speed of the current is 2 mph, and the speed of the boat in still water is 18 mph?

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a group of tourists went downstream a river and are supposed to return in 3 hours. how far can the tourists travel down the river if the speed of the current is 2 mph, and the speed of the boat in still water is 18 mph?