A) 33.3 kmph
B) 20 kmph
C) 25 kmph
D) 35 kmph
Correct Answer: D
Solution :
\[V=\sqrt{\frac{V_{1}^{2}+V_{2}^{2}}{2}}=\sqrt{\frac{{{30}^{2}}+{{40}^{2}}}{2}}=\sqrt{\frac{2500}{2}}\] \[=\frac{50}{\sqrt{2}}=35\,\,kmph\]
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