A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:

Suppose he move 4 km downstream in x hours. Then,

Speed downstream = 4/x km/hr.
Speed upstream = 3/x km/hr.

48/(4/x) + 48/(3/x) = 14 or x = 1/2 .
So, Speed downstream = 8 km/hr, Speed upstream = 6 km/hr.

Rate of the stream = (1/2)*(8 - 6) km/hr = 1 km/hr.