A man can swim upstream at 6 km/h and downstream at 10 km/h. What is the speed of stream and speed of man in still water ?
Answer & explanation
Correct answer: option 2
The correct answer is option (2) : speed of stream =2 km/hr, speed of man in still water = 8 km/hr
upstream speed, $v=6\, km/h$
downstream speed $u= 10\, km/h$
speed of stream $y = \frac{u-v}{2}=\frac{10-6}{2}= 2km/hr$
speed of man in still water $x=\frac{u+v}{2}=\frac{10+6}{2}= 8\, km/hr$