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[" 17.A swimmer wishes to cross a "500m"...

[" 17.A swimmer wishes to cross a "500m" wide river flowing "],[" at "5km/h" .His speed with respect to water is "3km/h" ."],[" (a) If he heads in a direction making an angle "theta" with "],[" the flow,find the time he takes to cross the river."],[" (b) Find the shortest possible time to cross the river."]

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