The speed of a boat in still water is 6 km/h. It takes the boat twice as long to row up as to row down the river. Find the rate of the stream.

(a) 1 km/hr, 6 km/hr
(b) 4 km/hr, 6km/hr
(c) 2 km/hr, 9 km/hr|
(d) None of these
(e) 3 km/hr, 8 km/hr


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