Question

A boat goes 16 km in 2 hour along the stream and for same distance boat takes 4 hour opposite the stream. what is speed of boat in still water = ?

Answer 1

Let speed of the steamer in still water =x=x km/hr

Speed downstream =(x+2)=(x+2) km/hr
Distance between the ports =4(x+2)=4(x+2) km ---(1)

Speed upstream =(x−2)=(x−2) km/hr
Distance between the ports =5(x−2)=5(x−2) km ---(2)

From (1) and (2)
4(x+2)=5(x−2)4x+8=5x−10x=18