A) \[15\text{ }kmph\]
B) \[20\text{ }kmph\]
C) \[24\text{ }kmph\]
D) \[\text{18 }kmph\]
Correct Answer: D
Solution :
Let the speed of the boat in still water be 'x' kmph. The speed downstream \[=(x+2)\,kmph\] The speed upstream \[=(x-2)\,kmph\] We have, \[4(x+2)=5(x-2)\] \[\Rightarrow \] \[4x+8=5x-10\] \[\Rightarrow \] \[x=10+8\,\,kmph\] \[\Rightarrow \] \[x=18\,\,kmph\]You need to login to perform this action.
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