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Statement of Pythagoras' Theorem

a swimmer cro...

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a swimmer crosses a flowing river of width d to and fro in time t1.the time taken to cover the same dis†an ce up and downstream is t2.if t3 is the time the swimmer would take to swim a dis†an ce 2d in still water then a)t_2^2=t_1 × t_2 b)t_1^2 =t_2 × t_3 i haven't unders†an d the solution provided.

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