About road across the river at rate of 9 km per hour the river flows at rate of 12 km per hour the velocity of
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Explanation:
The velocity of river flow is 12 km/hr
And, The velocity of the boat with which it is rowed (across the river means it will be perpendicular) is 9 km/hr
Therefore, the net velocity of boat will be the sum of both velocities.
\begin{lgathered}12i + 9j \\ \sqrt{ {12}^{2} + {9}^{2} } \\ \sqrt{144 + 81} \\ \sqrt{225} \\ 15\end{lgathered}
12i+9j
12
2
+9
2
144+81
225
15
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