Answers

2015-02-02T14:49:27+05:30
Let speed of boat be x and speed of stream be y
them speed of boat downstream is x+y and upstream is x-y
now 
16/x+y=2
x+y=8---------------------------1
and 16/x-y=4
x-y=4-----------------------2
from 1 ad 2
x=6 
and y=2
speed of boat in still water is 6km/hr

0