The velocity of the yacht must be such that over the distance A the current v will push it sideways by the distance B.
Find the (equation for the) time taken for the flow v to push the yacht a distance of B
find the (equation for the) speed (along the channel) required for the yacht to move the Distance A in that time.
This gives you (the equations for) two (perpendicular) velocities
add (the equations for) these two velocities to get the (equation for the) total velocity of the yacht.
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Last edited by Woody; Sep 22nd 2019 at 05:08 AM.
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