You are Rama Shankar studying in class 10th-c of Govt. Mult. Higher sec. school Surf. write an application to the secretary, Board of secondary education for duplicate marksheet.
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Hari starts rowing in a river from a point A to a point B against the flow. As soon as he reaches point B he immediately starts rowing back to point A in the
same path. If he takes 5 hours to reach "B" from "A" and 4 hours to reach "A from " B",
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