A) 42.5 km/hr
B) 40.0 km/hr
C) 37.5 km/hr
D) 35.0 km/hr
Correct Answer: C
Solution :
Distance average speed\[=\frac{2{{v}_{1}}{{v}_{2}}}{{{v}_{1}}+{{v}_{2}}}\]\[=\frac{2\times 30\times 50}{30+50}\] \[=\frac{75}{2}=37.5\ km/hr\]
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