A) \[25\,\,km/hr\]
B) \[24\,\,km/hr\]
C) \[50\,\,km/hr\]
D) \[5\,\,km/hr\]
Correct Answer: B
Solution :
Distance average speed\[=\frac{2{{v}_{1}}{{v}_{2}}}{{{v}_{1}}+{{v}_{2}}}\] \[=\frac{2\times 20\times 30}{20+30}\] \[=\frac{120}{5}=24\ km/hr\]
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