a boat goes 24 km upstream and 28 km downstream in 6 hrs. it goes 30 km upstream and 21 km downstream in 6. 5 hrs. find the speed of the boat in still water and also speed of the stream.
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an organization of workers formed to protect the rights and interests of its members. : an act of joining two or more things together. : a group of states or nations that are ruled by one government or that agree to work together.
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