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ATQ,
Let the downstream speed of a boat and the speed of stream be 6x km/hr and 'x' km/hr respectively.
Or, upstream speed of boat = 6x - x - x = 4x km/hr
ATQ,
(144/6x) + (144/4x) = 20
Or, (24/x) + (36/x) = 20
Or, (60/x) = 20
So, 'x' = 3
So, speed of boat in still water = 6x - x = 5x = 5 × 3 = 15 km/hr
So, required time = (180/15) = 12 hours
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