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[" A river "4.0" miles wide is flowing a...

[" A river "4.0" miles wide is flowing at the rate of "2],[" miles "/hr" .The minimum time taken by a boat to "],[" cross the river with a speed "v=4" miles "/hr" (in still "],[" water is approximately "],[" (1) "1hr" and "0" minute "],[" (2) "2" hr and "7" minutes "],[" (3) "1hr" and "12" minutes "],[" (4) "2" hr and "25" minutes "]

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