A) 4 km/h
B) 2 km/h
C) 6 km/h
D) 5 km/h
Correct Answer: B
Solution :
Let Speed of person in still water = u km/h and Speed of stream = v km/h, then \[\,u+v=\frac{1\,\,km}{\frac{10}{60}h}=6\,\,km/h\] ?(i) \[u-v=\frac{1\,\,km}{\frac{30}{60}h}=2\,\,km/h\] ?(ii) On subtracting Eq. 9i0 from Eq. (ii), \[2\text{v}=6-2=4\] \[\therefore \]Speed of stream \[(v)=\frac{4}{2}=2\,\,km/h\]You need to login to perform this action.
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