$\displaystyle \begin{array}{l}\text{Resultant velocity i}\text{.e}\text{.}\\{{v}_{{re}}}=\sqrt{{{{v}_{s}}^{2}+{{v}_{r}}^{2}}}\\\text{So, }\sqrt{{{{5}^{2}}+{{3}^{2}}}}=\sqrt{{25+9}}=\sqrt{{34}}\\\approx 5.83~m/s\end{array}$
$\displaystyle \begin{array}{l}\text{Resultant velocity i}\text{.e}\text{.}\\{{v}_{{re}}}=\sqrt{{{{v}_{s}}^{2}+{{v}_{r}}^{2}}}\\\text{So, }\sqrt{{{{5}^{2}}+{{3}^{2}}}}=\sqrt{{25+9}}=\sqrt{{34}}\\\approx 5.83~m/s\end{array}$
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