the speed of a boat along the stream is 12km /h and against the stream is by the boat to sale 24 km in still water is
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Speed of downstream
D = 12 km/h
Speed of upstream
U = 8 km/h
Speed of boat in still water = (D + U) / 2
= 20/2 = 10 Km/hr
Time taken by the boat in still water = distance/ speed
= 24Km/ 10Km/hr
= 2.4 hr
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