A boat's man goes 48 km downstream in 8 hours and returns back in 12 hours. Find the speed of the boat in still water and the rate of the stream?

Rate downstream = 48/8 = 6 km/hr Rate upstream = 48/12 = 4 km/hr ∴ Speed of boat in still water = (6 + 4)/2 = 5 km/hr Rate of stream = (6 -4)/2 = 1 km/hr