A) 48 km/h
B) 50 km/h
C) 54 km/h
D) 55 km/h
Correct Answer: A
Solution :
Average speed \[=\left( \frac{2xy}{x+y} \right)\text{km/h}\] \[=\left( \frac{2\times 40\times 50}{40+60} \right)\text{km/h}=48\,\,\text{km/h}\]You need to login to perform this action.
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