A) 1
B) 1.5
C) 2
D) 1.75
Correct Answer: B
Solution :
Rate downstream \[=\frac{18}{4}=\frac{9}{2}\,\,\text{km/h}\] Rate upstream \[=\frac{18}{12}=\frac{3}{2}\,\,km/h\] Now, speed of the stream \[=\frac{\text{Rate downstream}-\text{Rate upstream}}{2}\] \[=\frac{\frac{9}{2}-\frac{3}{2}}{2}=\frac{6}{4}=\frac{3}{2}=1.5\,\,\text{km/h}\]You need to login to perform this action.
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