Displacement of boat?

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boat moves through water of river 10 m/s relative water. regardless of boat's direction.iif water in river flowing @ 1.5 m/s, how long dose take boat make round trip consisting of 300 m displacement downstream followed 300 m displacement stream??

tried sooooooooooo many times , still worng

a boat moves through water of river 10 m/s relative water. regardless of boat's direction.iif water in river flowing @ 1.5 m/s, how long dose take boat make round trip consisting of 300 m displacement downstream followed 300 m displacement stream?? tried...


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