A boat goes 12 km upstream and 40 km downstream in 8 hours. It can go 16 km upstream and 32 km downstream in the same time. Find the speed of the boat in still water and the speed of the stream.
(a) 5km/hr, 2km/hr
(b) 6km/hr, 3km/hr
(c) 6km/hr, 2km/hr
(d) 7km/hr, 5km/hr
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