A) \[47\frac{1}{3}\,kmph\]
B) \[27\frac{1}{3}\,kmph\]
C) \[53\frac{1}{3}\,kmph\]
D) \[62\frac{1}{3}kmph\]
Correct Answer: C
Solution :
Total distance covered = 300 + 500 = 800 km. Total time taken to cover 800 km \[=\frac{300}{45}+\frac{500}{60}=\frac{20}{3}+\frac{25}{3}\,=\frac{45}{3}\,=15hr\]. \[\therefore \] Average speed \[=\frac{800}{15}=\frac{160}{3}\] \[=53\frac{1}{3}\,kmph\]
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