A) 900 m/h
B) 195 m/h
C) 192 m/h
D) 200 m/h
Correct Answer: C
Solution :
[c] Using the weighted HM formula \[\frac{1}{H}=\frac{1}{N}\sum\limits_{i=1}^{n}{\frac{{{f}_{i}}}{{{x}_{i}}}orH=\frac{1}{\frac{1}{N}\sum\limits_{i}{\frac{{{f}_{i}}}{{{x}_{i}}}}}}\] \[\therefore \] Average speed \[=\frac{400}{100\left( \frac{1}{100}+\frac{1}{200}+\frac{1}{300}+\frac{1}{400} \right)}\] \[=192m/h\]
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