A) \[\frac{{{n}_{1}}}{2}\]
B) \[2n\]
C) \[\frac{3{{n}_{1}}}{2}\]
D) \[\frac{2{{n}_{1}}}{2}\]
Correct Answer: C
Solution :
Total time taken to travel distance d is : \[\frac{d}{2{{n}_{1}}}+\frac{d}{2{{n}_{2}}}=d\left( \frac{{{n}_{1}}+{{n}_{2}}}{2{{n}_{1}}{{n}_{2}}} \right)=\frac{d}{{{n}_{eff}}};\]\[{{n}_{2}}=3{{n}_{1}}\Rightarrow {{n}_{eff}}=\frac{3}{2}{{n}_{1}}\]
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