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Let the speed of boat in still water =B and speed of stream =S B=12km/h, S= 3km/h Speed of the boat in upstream =B-S=9km/h Speed of the of the boat in Downstream =B+S =15km/h ATQ- Total time = (135/9 +135/15) =15+9=24hours.
Who developed Hydrogen Bomb?
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At field capacity the moisture is held with soil water potential at __ ?
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Which of the following method is most effective in conferring disease resistance among distantly related species?
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