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