A) 2.2 kmph
B) 3.2kmph
C) 2.8 kmph
D) 1.8 kmph
E) 3 kmph
Correct Answer: C
Solution :
Let the speed of the swimmer be\[x\]kmph in still water. \[\therefore \] Speed downstream will be (x + 2) kmph and speed upstream will be (x - 2) kmph. \[\therefore (x+2)\times \frac{20}{60}=(x-2)\times \frac{120}{60}\] or, \[\frac{(x+2)}{3}=(x-2)\times 2\] or, \[x+2=6x-12\] or, \[12+2=6x-x\] \[\therefore x=\frac{14}{5}=2.8\,kmph\]You need to login to perform this action.
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