A ferry cross a river of width d. The speed of the boat is v relative to the water, and the speed of the tidal current is w parallel to the riverbanks. The ferry landing points are directly opposite each other on each side of the river. How long does the shortest return trip take?(adsbygoogle = window.adsbygoogle || []).push({});

My attempt: vector v and vector w add to form vector v+w, which is directionally a straight line between the 2 ferry landing points. Then, (v+w) = d/t, and t = d/(v+w), where d, v and w are all vectors. Is this correct? The answer seems too simplistic.

Thanks to everyone for taking the time to look at this. Your help is much appreciated!

Best,

jollyrancher99

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