A) 12
B) 6
C) 8
D) 10
E) None of these
Correct Answer: D
Solution :
\[{{M}_{1}}{{D}_{1}}={{M}_{2}}{{D}_{2}}\] \[\Rightarrow \]\[8\times 15=12\times {{D}_{2}}\] \[\Rightarrow \]\[{{D}_{2}}=\frac{8\times 15}{12}=10\]hours
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