A) \[30\,\,\min \]
B) \[45\,\,\min \]
C) \[75\,\,\min \]
D) \[120\,\,\min \]
Correct Answer: C
Solution :
\[S=v\times t\], For the first\[30\,\,km\] \[30=60\times {{t}_{2}}\Rightarrow {{t}_{2}}=45\,\,\min \] For the next \[30\,\,km\] \[30=40\times {{t}_{2}}\Rightarrow {{t}_{2}}=45\,\,\min \] Hence,\[t={{t}_{1}}+{{t}_{2}}=30+45=75\,\,\min \]
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