A boat goes 40 km in the stream in 8 hours 36 km downstream in 6 hours The speed of the boat in stil...........

Explanation:

Speed of upstream, U = 40/8 = 5 km/h
Speedo of Downstream, D = 36/6 = 6 km/h
Speed of boat in still water, x = (D + U)/2
= (5 + 60)/2 = 11/2 = 5.5 km/h