A) 2 km/h
B) 3 km/h
C) 4 km/h
D) 5 km/h
Correct Answer: C
Solution :
Suppose the speeds are x km/h and y km/h respectively, then the average speed during the journey \[=\frac{2xy}{x+y}\text{km/h}\] So, after putting the value of x and y, we have the average speed \[=\frac{2\times 6\times 3}{6+3}=\frac{36}{9}=4\,\,\text{km/h}\]
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