A boat covers a distance of 55 km downstream in 5 hours while it takes 11 hours to cover the same distance upstream. What
is the speed of the boat?

Question

Accepted Answer

Let the speed of the boat in still water be 'b' km/h and the speed of the stream be 's' km/h.

Downstream speed = b + s  
Upstream speed = b - s

Given:  
Distance = 55 km   
Time downstream = 5 hours  
Time upstream = 11 hours

Using speed = distance/time:    
Downstream speed = 55/5 = 11 km/h   
Upstream speed = 55/11 = 5 km/h

From these, we have two equations:   
1) b + s = 11   
2) b - s = 5

Adding both equations:  
2b = 16  
b = 8 km/h

Therefore, the speed of the boat in still water is 8 km/h.

Answer

Answer

Answer