A) \[9\frac{1}{3}hr.\]
B) \[10\,hr.\]
C) \[12\,hr.\]
D) \[8\frac{1}{3}hr.\]
Correct Answer: C
Solution :
Rate downstream = 5 kmph Rate upstream = 1 kmph \[\therefore \] Required time\[=\frac{10}{5}+\frac{10}{1}=12\]hours
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