$\begin{array}{1 1}400s\\100s\\200s\\300s\end{array} $

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Answer : 400s

Down stream :

$\overrightarrow{V}_{PS}=\overrightarrow{V}_{PW}+\overrightarrow{V}_{WS}$

$\Rightarrow V_{PS}=2.0+1.0$

$\Rightarrow V_{PS}=3.0m/s$

$x=vt$

$\Rightarrow t=100s$

Upstream :

$\overrightarrow{V}_{PS}=\overrightarrow{V}_{PW}+\overrightarrow{V}_{WS}$

$\Rightarrow V_{PS}=2.0+(-1.0)$

$\Rightarrow V_{PS}=1.0m/s$

$x=vt$

$\Rightarrow t=300s$

$\Rightarrow$ time =100+300=400s

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