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[" 21.Boal goes "30km" upsiream and "44k...

[" 21.Boal goes "30km" upsiream and "44km],[" downstream in "10hrs" .It goes "40km" upstream "],[" and "55km" downsliteam in "13hrs" .Speed of "],[" stream and boal in still water are "],[(A)6km/hr" and "4km" ."]

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