Q:
      
      
         
            
The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer:          
         Explanation: Ans.  Suppose the speed of boat in still water is x km/h and speed of stream is y km/h
Speedof boat in downstream = (x + y) km/h x+ y = 32 …(i) 
Speed of boat in upstream = (x – y) km/h
x – y = 28 …(ii)
Add. Eqs. (i) and (ii), we get 2x = 60
x = 30 km/h
 
 
 
       
      
      
      
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