THE SPEED OF A MOTOR LAUNCH WITH RESPECT TO STILL WATER IS 18m PER SEC AND THE SPEED OF STREAM IS IS 4m PER SEC. WHEN THE LAUNCH BEGINS TRAVELLING UPSTREAMS A FLOAT WAS DROPPED FROM IT.THE LAUNCH TRAVELLED 4.8 Km UPSTREAM, TURNAD ABOUT AND CAUGHT UP WITH THE FLOAT. HOW LONG IS IT BEFORE THE LAUNCH REACHES THE FLOAT?

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