A) 3
B) 2
C) 1.5
D) 1
Correct Answer: A
Solution :
Let the speed of motorboat \[=x\,\text{km/h}\]c and the speed of water \[=y\,\text{km/h}\] By given condition, \[\frac{9}{x+y}=2\] \[\Rightarrow \] \[2x+2y=9\] ?(i) and \[\frac{9}{x-y}=6\] \[\Rightarrow \] \[6x-6y=9\] ?(ii) On solving Eqs. (i) and (ii), we get \[x=3\text{ km/h}\]and \[y=1.5\text{ km/h}\] Hence, the speed of boat \[=3\text{ km/h}\]You need to login to perform this action.
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