A) 3 km/h
B) 6 km/h
C) 10 km/h
D) 12 km/h
Correct Answer: A
Solution :
Speed of current \[=\frac{1}{2}(\text{Rate}\,\,\text{downstream}-\text{Rate}\,\,\text{upstream)}\] \[=\frac{1}{2}(12-6)\,\,\text{km/h}\] \[=3\,\,\text{km/h}\] \[\left[ \therefore \text{Rate}\,\,\text{downstream}=\frac{1}{5}\times 60=12\,\,\text{km/h} \right]\]
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