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Global form fields

A boat moving upstream with velocity 3 <img src="data:image/png;base64,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" class="Wirisformula" alt="m divided by s" width="36" height="15" style="vertical-align:-1px" role="math" data-mathml='«math xmlns=¨http://www.w3.org/1998/Math/MathML¨ »«mi»m«/mi»«mo»/«/mo»«mi»s«/mi»«/math»'/>w.r.t. ground. An observer standing on boat observes that swimmer 'S' is crossing the river perpendicular to the direction of motion of boat. If river velocity is 4m/s &amp; swimmer crosses the river width 100 m in 50 sec then -<br /><strong><img src="https://mycourses.turito.com/tokenpluginfile.php/c161933dbfaab094c54655ab71e9b8f0/1/question/questiontext/904055/1/896783/Picture148.png" alt="" width="145" height="79" /></strong>

Solution for the question - a boat moving upstream with velocity 3 m//s w.r.t. ground. an observerstanding on boat observes that swimmer 's' is crossing the riv