A) \[\frac{x+y}{{{k}_{^{1}}}+{{k}_{^{2}}}}km\text{/}h\]
B) \[\frac{{{k}_{^{1}}}{{k}_{^{2}}}(x+y)}{x{{k}_{2}}+y{{k}_{1}}}km\text{/}h\]
C) \[\frac{x{{k}_{^{1}}}+y{{k}_{^{2}}}}{{{k}_{2}}+{{k}_{1}}}km\text{/}h\]
D) \[\frac{xy({{k}_{1}}+{{k}_{^{2}}})}{x{{k}_{1}}+y{{k}_{2}}}km\text{/}h\]
E) None of these
Correct Answer: B
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