A) \[4\]
B) \[6\frac{1}{2}\]
C) \[3\frac{1}{2}\]
D) \[8\]
Correct Answer: B
Solution :
[b] Let, the speed of boat in still water is x km/h and the speed of current is y km/ h. Then, according to the question, \[x+y=\frac{1}{\left( \frac{7.5}{60} \right)}=8km/h\] and \[x-y=\frac{5}{1}=5\,km/h\] \[\therefore \] \[x=\frac{8+5}{2}=\frac{13}{2}=6\frac{1}{2}\,km/h\] |
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