A) 4 m/h
B) 3 m/h
C) 2.5 m/h
D) 2 m/h
Correct Answer: D
Solution :
[d] Let speed of the stream \[=x\,m/h\] Speed of the boat in still water\[=10\,m/h\] \[\therefore \]Speed of boat downstream\[=(10+x)\,m/h\] Speed of boat upstream\[=(10-x)\,m/h\] \[\therefore \] \[\frac{36}{10+x}+\frac{90}{60}=\frac{36}{10-x}\] \[\Rightarrow \] \[x=2\,m/h\] |
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