The speed of a stream is 3 km/hr and the speed of a man in still water is 5 km/hr. The time taken by the man to swim 26 km downstream is :
[A] $13 hrs$
[B] $5\frac{1}{5}hrs$
[C] $3\frac{1}{4}hrs$
[D] $8\frac{2}{3}hrs$