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Solutions
Speed of boat in still water=x
Speed of stream=x * 80/100=4x/5
Downstream speed=x + 4x/5=9x/5
Upstream speed=x – 4x/5=x/5
(9x/5 * 2 ) – (x/5 * 14) = 20
4x/5=20
X=25
Speed of downstream=9 * 25/5=45 kmph