A woman can swim 8 km/h in still water. If the speed of the stream is 4 km/h, then what is the time taken by the woman to cover the distance of 16 km upstream ?

4

The correct answer is option (1) : 4

Speed of woman upstream $= (8-4) km/hr $

$= 4\, km hr$

$distance = 16\, km $

$∴time \, taken =\frac{Distance }{Speed}= \frac{16}{4}= 4\, hrs $