A) 3 min
B) 6 min
C) 2 min
D) 9 min
Correct Answer: D
Solution :
In series \[\frac{1}{{{P}_{S}}}=\frac{1}{{{P}_{1}}}+\frac{1}{{{P}_{2}}}\] \[\Rightarrow \,\,\,\,\frac{1}{({{H}_{s}}/{{t}_{s}})}\,\,=\,\,\frac{1}{({{H}_{1}}/{{t}_{1}})}\,\,\,\,+\,\,\frac{1}{({{H}_{2}}/{{t}_{2}})}\] \[\because \,\,\,\,\,\,{{H}_{s}}={{H}_{1}}={{H}_{2}}\] So \[{{t}_{s}}={{t}_{1}}+{{t}_{2}}=6+3=9\,\,\min \]
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