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Standard Formulae - 1

a swimmer cro...

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a swimmer crosses a flowing river of width d to and from in time t_{1 }.The time taken to cover the same dis†an ce up and down stream is t_{2.}If t_3is the time the swimmer would take to ewim a dis†an ce 2d in still water. then a.t_2^2=t_1t_3 b.t_3 =t_{1.}\ast t_2 c.t_1=t_2\ast t_3 d.t_3t_1+t_2

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